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STD 7000
MP4
Keyboard Monitor
USER'S MANUAL
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NOTICE
The information in this document is provided for reference only. Pro-Log does not assume any liability arising
out of the application or use of the information or products described herein.
This document may contain or reference information and products protected by copyrights or patents and
does not convey any license under the patent rights of Pro-Log, nor the rights of others.
Printed in U.S.A. Copyright@ 1981 by Pro-Log Corporation, Monterey, CA 93940. All rights reserved. However,
any part of this document may be reproduced with Pro-Log Corporation cited as the source.
0
PROGRAM
MP-4 KEYBOARD MONITOR
()
THIS PBOGBAM IS INTENDED FOR USE ~lTtl THE PRO-LOG 7801 (8085)
OR 1805 (L80) CPU BOARDS AND THE 1505 KEYBOARD/DISPLAY CARD.
IT PROVIDES THE USER WITH A MONITOR AND BEBUGGING PROGRAM THAT
RESIDES IN A 2/1b EPROM) FROM ADDRESS 00 0 HEX TO O/FF HEX.
THE PROGRAM ALSO PROVIDES THE USER WITH SEVERAL INDEPENDENTLY
ACCESSIBLE PROGRAM MODULES (SUBROUTINESO THAT CAN BE CALLED
BY THE USER OR MOVED INTO HIS PROGRAMS. THESE INCLUDE MODULES
TO ALLOW HIM TO FULLY EXERCISE THE 7303 KEYBOARD AND APLHANUMERIC DISPLAYS.
IN ADDITION) THE CAPABILITY TO TRANSFER DATA FROM A PRO-LOG
PROM PROGRAMMER TO THE USER'S SYSTEM) OR VICE VERSA) IS PROVIDED WHEN UTILIZED IN CONJUNCTION WITH A PIN-114 PARALLEL
INTERFACE TO PROM PROGRAMMER.
-
....
SYSTEM DESIGNATION
IPRODUCT
CONFIG. DESIGNATION
CLOCK STATE TIME
DOCUMENT
105680
105685
PS-IB (8085):
7801, 7303,
MP-4
0.32 usec.
PS-3B (Z80):
7803, 7303,
MP-4
0.40 usec.
and
105675
BASIC MEMORY ADDRESSES IN HEX
ROM
1st/LAST ADR
1st/LAST ADR
0000-07FF
2000-23FF
(0800-HFF)k
(2400-2FFF)*
RAr~
*Empty sockets. User may add
to CPU by installing ROMs
and RAMs. Additional ROM
and RAM can be added with
7701 or 7702 memory hoards.
PIN 114:
7505, 7140,
RC50-6
PORT ASSIGNMENT FOR I/O
FUNCTION
PORT BIT
Switch S1
Switch S2
IN 00-6
IN 00-7
Keyboard Inputs
IN 00-0 thru
00-5
Keyboard Enables OUT 00-0 thru
00-3
Display Data
OUT DO all bits
Display Control
OUT 01-0 thru
03
Pt'ograrnmer
Programmer
Programmer
shake in
Programmer
shake out
1
Da ta IN 52 all bits
Data OUT 50 a11 bi ts
I-iand- IN 51-0 thru
51-2
Hand- OUT 51-5 thru
51-7
-I
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TABLE OF CONTENTS
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PAGE
2. SYSTEM REQUIREMENTS
5
5
3. MONITOR DESCRIPTION
6
4. MONITOR OPERATION
7
1. GENERAL
5. MONITOR/PROM PROGRAMMER INTERFACE
26
6. MONITOR USE WITH M900B OR M980 PROM PROGRAMMER
27
7
27
I
•
MONITOR USE WITH M824 OR M825 MICROPROCESSOR
SYSTEM ANALYZER
8. MONITOR PROGRAM LISTING
C
A.
FORWARD
29
B.
MONITOR CONTROL PROGRAM FLOWCHART
30
C.
MONITOR PROGRAM MEMORY MAP
33
D.
RAM VARIABLE MEMORY MAP
34
E.
PROGRAM LISTING
35
67
9. ApPLICATION SOFTWARE MODULE DESCRIPTIONS
•
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MP-4 KEYBOARD
MONITOR PROGRAM
General
The MP-4 Keyboard Monitor Program is intended to be a program development aid
and program debugging tool for the STD BUS user. It is designed to be used
with the PRO-LOG 7303 Keyboard/Display Card as the I/O device and a 7801 (8085)
or 7803 (Z80) CPU Card. It is fully compatible and useable with the PRO-LOG
M900, M900B, M920 and M980 PROM Programmers as well as the M824 and M825 System
Analyzers. In addition to providing the user witn several useful editing and
debugging functions, there are many resident, independently accessible program
modules (subroutines) that may be called by the user or moved into his programs.
These include routines to fully exercise the 7303 alpha-numeric displays and
keyboard, a variable time delay module, and a Hex to ASCII conversion routine.
c
The Monitor can also double as a diagnostic tool for the engineer or technician.
When switches Sl and S2 on the 7303 card are closed, or if the 7303 is not in
place, program, control is transferred to address 0800 Hex (ROM 1) and all monitor
functions are bypassed. If the Monitor PROM is retained in the finished product,
and if the user's permanent main program starts at address 0800 Hex, the Monitor
program will be transparent until the 7303 is inserted into the rack and either
or both switches are not closed. At that time, all Monitor functions will become
available to allow debugging in place.
Monitor resident software is provided to allow the user to transfer data from
the microprocessor system to the PROM programmer and vice versa. This requires
a PRO-LOG PROM Programmer equipped with the 9104, 9114, or 9814 Parallel Interface
Option, and a PIN-114 Parallel Interface Option for STD BUS Prototyping Systems.
System Requirements
The Monitor program resides in one Intel 2716 EPROM or equivalent and occupies
addresses 0000 through 07FF Hex. Program parameters and stack operations use
addresses 2000 through 204F Hex. User programs must start at locations which are
not part of these address fields. In addition, all but the first two restart locations are available to the user for vectored interruDt. However, the Non-Maskable
locations 0024-0026 Hex (8085) and 0066-0068 Hex (Z80) are utilized in the program
to cause the contents of the internal registers to be displayed in the 7303 displays upon the occurrence of a Non-Maskable Interrupt (NMI). This interrupt can
be generated coincident with any program address by the M824 or M825 System Analyzers.
Also, restart location 0038 Hex contains an unconditional jump to location 2020
Hex in RAM. The user can program an unconditional jump into locations 2020-2022
to vector his Restart 7 interrupt to any location in memory.
•
With all RAM socketed on the 7801 or 7803 CPU Card, user programs and data may
reside in address locations 0800-1FFF (ROM) or 2050-2FFF (RAM). Additional memory
may be added (4000-FFFF) with the addition of PRO-LOG 7701 or 7702 memory boards .
5
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Monitor Description
The Monitor program utilizes the eight alpha-numeric displays and twenty-five
keys provided on the 7303 Keyboard/Display Card. The keyboard is divided into
a Hex key pad (keys O-F), a system RESET key, and 8 function keys. Each key
has a removable, transparent cap. Labels are provided wjth which the user may
label each of the function keys (keys 10-17) by removing the cap, inserting the
label, and replaceing the cap. A keyboard layout diagram is shown in Figure 1.
to facilitate labeling.
Data movement/manipulation
functions.
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r4l[illJ~r&JfRE=l
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[]808~
8[]D[]~
DDDDOO
Program development/
debugging functions.
4[)
8DDD~
Figure 1.
7303 Keyboard Labeling.
Each of seven keys provides the capability of implementing the functions or
commands so labeled, one upper and one lower function per key. To select an
upper function, the user first depresses the shift key (t), then the desired
key. To select a lower function the user merely depresses the desired key.
Operation is similar to that of many conventional hand-held calculators.
The function keys are grouped by application. The horizontal row of function
keys provide several data movement, manipulation and memory conditioning capabilities. The vertical column of function keys provide program development
and debugging capabilities.
6
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Upon power-on or pushbutton reset, the prompt word "READY?" is displayed in the
7303 alpha-numeric displays. The subsequent selection of any command will result
in the display being blanked, followed by the name of the command for approximately
3/4 second. This verifies to the user that he has selected the desired function
or command. Throughout several functions, the prompt word "BUSY" is displayed
while the processor is completing the execution of that function. Several other
prompt words are utilized by individual routines to enhance user entry or information.
All Monitor routines are exited by depressing the "RESET" key, or upon completion
of the function, in which case control is returned to the Monitor and READY? is
again displayed.
II
II
Monitor Operation
To select a specific command, depress the appropriate combination of shift (t) and
function key. The display will blank and then the name of the function will appear
centered in the display for 3/4 second. SST (Single Step), BST (Back Step), and
CLR (Clear Entry) are not commands.
All command functions except STR and RUN require the user to enter one or more
4-digit Hex addresses. When an address entry is required, the prompt "____ " will
be centered in the display. Enter the address, most significant digit first, from
the hex keypad. As each digit is entered, it will be displayed, thereby replacing
the prompt characters. After entering all 4 digits, depress SST. The address
will disappear and the function will continue execution.
Several commands (EDT, STR, FLM) may require the user to enter 2-digit Hex data.
As before, enter the data from the Hex keypad, most significant digit first. The
data will appear in the display as it is entered. At the completion of entry,
depress SST and the function will continue execution.
Should the user enter an address or data digit in
depressing the CLR key. Each time the CLR key is
the left will blank starting with the last entry.
entered. All corrections must be made before SST
error, it may be corrected by
depressed, the next digit to
The digit(s) may then be reis depressed.
During the course of the execution of the commands RCV, MOV and FLM, data is
written into RAM. If the RAM location fails to accept the data, or ROM is written
to, or the address written to does not exist in the system, then the execution of
the function will halt and the address of the bad location and its data will be
displayed. To abort further execution, depress RESET. To continue execution,
depress SST. Execution will continue until completion, or until another bad location is encountered.
A description of each command, its suggested application, and instructions for
its utilization is included in the following pages .
•
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Monitor Displays
II
II
To Prompt an
Address Entry.
*User Enters a
4-digit Hex
Start Address
From Keyboard.
Monitor Displays
Address and Data
of Selected
Location.
*User Depresses
SST, BST, or a
Hex Key from
Keyboard as Data.
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YES
Monitor Decrements Address
to Next Lower
Location.
YES
Monitor Increments Address
to Next Higher
Location.
YES
*User Enters
2nd Digit of
Data from
Keyboard.
8
----
~.-
~.---------~-.~~~--~~-.--.--~-----.~-~~--.~----~---------.-.---~-~---
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EDIT data in memory.
This command allows the user to display a desired address and resident data in
the 7303 alpha-numeric displays, and modify the data, if desired. After entering
the desired starting address, the address and data will be displayed as 4 Hex
digits of address and 2 Hex digits of data separated by 2 spaces (AAAA DD).
The user may modify the data by merely depressing 2 Hex keys on the keyboard.
The data will be displayed as it is entered, and will replace the original data.
SST must be depressed to enter the data into memory, following data entry.
If the user desires not to modifiy data, he may advance to the next higher location
by depressing SST. At that time the address will be incremented and the address
and data of the next location will be displayed. The user may also depress BST,
thereby decrementing the address to the next lower location and display its address
and data.
To exit this command function, depress RESET.
The purpose of this function is to allow the user to enter program and data into
RAM for subsequent executuion and debugging.
Note;
•
If an "E" appears to the immediate left of the data, following a data entry,
it informs the user that the data was not accepted, i.e., the RAM location is
bad, or that area of memory is ROM or non-existent in the system. To continue,
depress SST to increment to the next location. To abort, depress RESET .
9
o
Monitor Displays
Last Entered
Execution Addres
for 1 second.
Monitor
Displays
II
.,
To Prompt an
Address Entry.
*User Enters a
4-digit Hex
Start Address
From Keyboard.
Monitor Displays
"*RUN*"
EXEC PGM
o
*User Depresses
RUN Key.
Monitor Initializes Registers,
Display, LEOs,
Start Address.
o
10
Enter EXECUTION ADDRESS into memory.
This command allows the user to enter a program execution starting address into
memory and is intended to allow the user to exercise programs entered into RAM
or ROM.
Upon selection of this command, the Monitor will display the last execution address entered in the 7303 alpha-numeric displays for approximately one second.
The display will then blank and the prompt "____ " will be displayed to indicate
to the user that a new 4-digit Hex execution start address must be entered. The
user may retain the current address by depressing RESET. Otherwise, the user
enters the new address and depresses SST.
After address entry, the display is blanked and then u*RUN*H is displayed. Tbe
program may now be executed by depressing RUN. The execution address will be
retained for subsequent program executions until it is changed by this command.
RUN the program at the previously entered execution address.
This command will allow the user to execute a program in RAM or ROM, repeatedly.
The execution start address is the last address entered via the XAD command.
Upon selection of this command, the Monitor blanks the display and LED's, disables
the keyboard, loads the registers with the values entered via the last STR command,
retrieves the execution address from memory and jumps to that address .
•
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SET REG
Monitor Displays
Next Register
Name and Data as
"REG r=dd".
*User Depresses
SST~, or a Hex key
From Keyboard as
1st Data Digit.
YES
*User Enters 2nd
Digit of Data
From Keyboard.
NO
o
NO
RESET
o
12
----~----~---.---
- -
Pre-SET Registers for program execution.
This command allows the user to enter a set of initial register values into memory.
Each time the user depresses RUN to commence execution of a program, or a portion
of a program, these values will be loaded into the internal registers before jumping to that program. In this way, program execution can be started with the processor in a known state. The entered values will remain the same until changed by
subsequent repetition of this command.
Upon selection of this command function, the Monitor will display "REG H=dd",
where "dd" is the last 2-digit Hex data entered for the initialization of the
H register. To enter new data, depress the desired 2 Hex keys, then depress the
SST key. To leave the data unchanged, depress the SST key directly. Each time
the SST key is depressed, the next register name and content will be displayed.
Depressing the SST key after the contents of the flag register, F, are displayed
will return control to the Monitor, and "READY?" will be displayed.
Register name and contents are displayed in the following order:
H, L, D, E, B, C, A, F.
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13
o
-
SET BKPT
Monitor Displays
II
II
To Prompt an
Address Entry.
Monitor Displays
Next Register
Pair Content as
IIrr=dddd
*User Enters a 4
Digit Hex
Breakpoint
Address.
*User Depresses
SST, or Hex Key
From Keyboard
as Data.
ll
RESET
•
YES
*User Enters 2nd,
3rd, and 4th
Digits of Register Pair Data.
o
RETURN
o
14
Set Breakpoint at user entered address.
This command allows the user to enter a breakpoint at any desired address in a
program that resides in RAM. When the breakpoint is encountered during program
execution, the execution will terminate and the internal register contents will
be displayed.
Upon selection of this cOJllTland function, the Monitor will display " ____ " as an
address prompt. Enter a 4-digit Hex address and depress the SST key. The Monitor will replace the original data at the designated address with a Restart 2
(D7 Hex) and save the original data in memory. Upon depression of the SST key,
control will be returned to the Monitor and READY? will again be displayed.
Care must be taken to insure that the breakpoint only be set at an address that
contains the first byte of an instruction. If this is not done, the restart
instruction will be misinterpreted as operand data.
II
II
Breakpoint Execution.
Upon encountering a breakpoint, program execution will terminate and the register
contents will be displayed, starting with IHL=dddd", where "dddd" is the 4-digit
Hex data contained in the HL register pair. At this point, the user may change
the data by entering 4 Hex digits of new data from the keyboard and depressing SST.
The data will remain unaltered by directly depressing SST, at which time the next
register pair name and data will be displayed in the same manner. Data is displayed
in the following order:
IHL=dddd", IDE=dddd", IBC=dddd", and IAF=dddd".
After the AF register pair data is displayed, execution can be resumed by depressing
SST. The Monitor will replace the restart instruction with the original data and
execution will resume at the breakpoint address. To leave the breakpoint set for
subsequent executions, depress RESET instead of SST.
Non-Maskable Interrupt Service.
Upon the occurrence of a non-maskable interrupt, the register pair contents will be
displayed and can be altered as described above. However, the Monitor will not
replace the breakpoint with original data .
•
15
FILL MEM
o
Monitor Displays
II ---- II
To Prompt an
Address Entry.
*User Enters a
4-digit "RAM
Start Address.
Monitor Displays
II - .. -.,.. II
To Prompt an
Address Entry.
*User Enters a
4-digit RAM
End Address.
o
Monitor Displays
II DATA? II
To Prompt a Data
Entry.
*User Enters 2
Hex Digits of
Data From the
Keyboard.
Monitor Displays
IIBUSY II
and Writes Data
into RAM Block.
RESET
16
o
Fill a block of memory with a single data value.
This command allows the user to write the same data value into all RAM locations
that lie between the user-entered address limits, inclusively. The data can be
any user-entered 2-digit Hex value.
Upon selection of this command function, the Monitor will prompt an address entry
by displaying "----". Enter the starting address to be written to. The Monitor
will prompt another address entry. Enter the ending address to be written to.
The Monitor will now display "DATA?" to prompt a data entry. Enter a 2-digit
Hex value from the keyboard. The data will be displayed as it is entered. Upon
completion of the data entry, the Monitor will display BUSY while it writes the
entered data into all locations within the address field. It then exits to RESET.
II
II
This command may also be used to test the integrity of a block of RAM. Should any
RAM location fail to accept the desired data, execution will halt and the bad
location address and data will be displayed. Depressing SST will cause execution
of the function to continue (See Monitor Operation).
c
It is suggested to the user that prior to entering a program into RAM for development or debugging, the memory be filled with the data that corresponds to the unprogrammed state of the PROM (00 or FF) in \t/hich it will eventually reside. Then,
if the program is subsequently transferred to the PROM programmer via the SND command, those areas of memory not actually part of the program will remain unprogramin the PROM .
•
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Monitor Displays
Monitor Displays
II
II
II
II
To Prompt an
Address Entry.
To Prompt a 3rd
Address Entry.
*User Enters a 4
Digit Source
Start Address.
*User Enters a 4
Digit Destination Start
Address.
Monitor Displays
II
Monitor Displays
BUSY"
and t~oves Da ta .
II
II
To Prompt a 2nd
Address Entry.
-
*User Enters a 4
Digit Source
End Address.
RESET
o
o
18
o
Move a block of data to another location in RAM.
This command allows the user to move any size block of data from ROM or RAM to
another area of RAM. Both backward and forward moves are allowed. As the Monitor moves the data, it clears the source area by writing 00 Hex (NOP) into each
source location.
Upon selection of this command function, the Monitor displays "____ " to prompt
an address entry. Enter the 4-digit Hex source starting address. Then the
Monitor will prompt a second address entry. Enter the source ending address.
The Monitor again prompts a third address entry. Enter the destination starting
address. At the completion of the last entry, the Monitor will display "BUSY",
and begin moving data to the new locations. If any location fails to accept
the data, execution will halt and the bad location address and data will be displayed. To resume execution, depress SST (see "Monitor Operation"). At the
completion of the move, the Monitor will exit to RESET and display "READY?".
This command can be used to move any Monitor software module into the user's
program. The source start and end addresses, and the destination address are
saved in memory for subsequent and repetitive address ajustment operations that
utilize the AJA command .
•
19
o
*User Enters a 4
Digit Programmer Ending
Address.
Monitor Samples
PROM Programmer
Interface.
Monitor Displays
II
To Prompt a 3rd
Address Entry.
NO
II
Monitor Displays
II
II
To Prompt an
Address Entry.
Monitor Displays
IINO PGMR!II
For One Second.
*User Enters a 4
Digit System
Memory Start
Address.
*User Resets
-
Monitor Displays
IIBUSY II
and Transfers
Data To/From pgr.
or Initiates
Programmer
Interlock.
*User Enters a 4
Digit Programmer Staring
Address.
RESET
-
o
RESET
Monitor Displays
II
To Prompt a 2nd
Address Entry.
II
o
20
o
Send a block of data to the PROM programmer.
This command allows the user to transfer a block of memory data from either ROM
or RAM to any PRO-LOG PROM Programmer equipped with a Parallel Interface Option.
To use this command, the PIN-114 Prototyping System Interface to PROM Programmer
must be installed to connect the microprocessor system to the programmer. When
using an M900 or M920 programmer, only personality modules for PROMs with a 512
word capacity, or greater, may be used. This restriction does not exist when
using the buffer equipped M900B or M980 units.
Upon selection of this command function, the Monitor determines if the PIN-114 is
installed, if the programmer is connected, and if the programmer is turned on.
If any of these conditions are not true, the Monitor displays "NO PGMR!" for one
second, then exits to RESET and displays "READY?".
If the programmer is on-line, depress the RESET key on the M900 or M900B programmer to initiate the interlock. If an M920 is used, turn it of~ then on again. The
M980 should not be RESET - the user must select Parallel Interface Option from the
keyboard, initially. All but the M980 must be reset before each subsequent data
transfer.
Next, the Monitor will display " ____ " as an address prompt. Enter a 4-digit Hex
programmer buffer or PROM starting address. The Monitor will prompt a subsequent
address entry. Enter the programmer buffer or PROM ending address. The Monitor
will prompt a third address entry. Enter the microprocessor system starting address.
The Monitor will then display IIBUSY" and transfer the block of data to the PROM
programmer. Upon completion of the transfer, the Monitor will exit to RESET and
display "READY?II, after dropping the interlock signal.
Receive a block of data from the PROM programmer and store it in RAM.
This command allows the user to transfer a block of data from the PROM programmer
PROM or buffer to system RAM. All restrictions and interface requirements specified for the SND command apply, as does the operating procedure. A further restriction exists in that the data must be transferred to valid RAM locations.
Should a RAM location fail to accept the data, or if the RAM capacitiy of the system
is exceded, or if transfer is to ROM, then execution will stop and the address and
data of the bad location will be displayed. Transfer may be resumed by depressing
SST (see "Monitor Operation") .
•
21
o
Monitor Displays
"
"
To Prompt an
Address Entry.
*User Enters a 4
Hex Digit Field
Start Address.
Monitor Displays
II
II
To Prompt an
Address Entry
*User Enters a 4
Hex Digit Field
End Address.
o
Monitor Displays
IIBUSY II
and Adjusts Jump
Addresses.
••
RESET
o
22
C)
I I
AJA
Adjust the addresses contained in 3-byte instructions after a
MOVE
Whenever a program or subroutine is moved from one area of memory to another,
it will not execute correctly unless the addresses contained in all 3-byte
Jump, Load, and Store instructions are changed to reflect the programs's new
location. This includes addresses contained within the moved program, and addresses in other areas of memory that may refer to the moved program's original
location.
This command allows the user to adjust the move-affected addresses within any
field of data. It may be used over as many fields as desired, and over any
size data field. All adjustments made to addresses are based on the parameters
of the last MOV operation. i.e., source start, source end, and destination start
addresses. The Monitor determines the displacement (source minus destination),
or how far the data was moved. It then searches for 3-byte instructions. The
operand (2nd and 3rd bytes) of each instruction found is examined. If the operand
value lies between the source start and end addresses, inclusive, the displacement
is added or-subtracted from the operand.
Upon selection of this corrmand function, the Monitor displays "____ " as an address
prompt. Enter the 4 Hex digit starting address of the field of data to be adjusted.
The Monitor will then prompt a second address entry. Enter the 4 digit ending address of the data field. The Monitor will then display "BUSY" as it searches for
3-byte instructions and adjust operands. Upon completion, the Monitor exits to
RESET and displays "READY?".
NOTE: This command operates only on the subset of instructions common to both
8085 and Z80. If ZSO special instructions are used, care must be taken
to insure they are not altered by this routine .
•
23
o
CHG ADR
Monitor Displays
"
"
To Prompt 4th
Address Entry.
Monitor Displays
II
"
To Prompt 1st
Address Entry.
*User Enters a 4
Digit Source
End Address.
*User Enters a 4
Hex Digit Field
Start Address.
Monitor Displays
"
"
To Prompt 5th
Address Entry.
Monitor Displays
II
"
To Prompt 2nd
Address Entry.
*User Enters a 4
Hex Digit Field
End Address.
*User Enters a 4
Digit Desti.nation Start
Address.
Monitor Displays
"
"
To Prompt 3rd
Address Entry.
Monitor Displays
"BUSY"
and Changes the
Addresses.
*User Enters a 4
Digit Source
Start Address.
o
RESET
o
24
Change all address bytes contained in 3-byte instructions.
This command allows the user to change all page and line addresses contained in
all 3-byte instruction operands within any area of RAM, by adding or subtracting
an offset to those operands. The offset, or displacement, is computed by the
Monitor from the source start and destination start addresses entered by the user.
If the user has developed a program in RAM, and desires to relocate it to ROM,
he can utilize this command to change the addresses of all Jump, Load and Store
instructions that would be affected, then transfer the altered program to the
PROM programmer. The converse is also true, in that the user can transfer the
contents of a PROM to RAM, change all dependent addresses, and execute the program.
Upon selection of this command function, the Monitor will prompt the entry of
five (5) addresses by displaying "____ ". Enter the following 4 Hex digit addresses
in the listed order:
1) The starting address of the data whose operands are to be altered.
o
2)
The ending address of the data whose operands are to be altered.
3)
The source starting address, i.e. the starting address of the area
in which the program was intended to operate.
4)
The source end address.
5)
The destination start address, i.e., the starting address of the
area in which the user desires the program to execute.
Upon completion of the last address entry, the Monitor will change all addresses
required, while displaying "BUSY". When finished, the Monitor will exit to RESET
and display "READY?".
If the user wishes to change addresses in segments, in order to bypass data tables,
the first area of data must be changed with the CHAD command, but subsequent areas
may be changed with the AJA command. The source start, source end, and destination
start address will be retained in memory until the next CHA operation.
*This command operates on those instructions that are common to the 8085 and Z80.
*If Z80 special instructions are used in the program, care must be taken to insure
*they are not altered by this function .
•
25
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t--.aaawa;iiMJiWNliW&lGiIiliRiiiM&IIi;waaiIOWiIi&I\
o
Monitor/PROM Programmer Interface
The Monitor program contains the necessary software to implement a direct parallel
data interface with the M900, M900B, M920 and M980 PRO-LOG PROM Programmers. The
M900 and M920 must be equipped with a 9104 Parallel Interface Option which is described in detail in Section 8 of the respective operating manuals. The M900B requires the 9114 Parallel Interface Option which is described in Section 11 of the
operating manual. The M980 provides the 9814 Parallel Interface as described in
Section 19 of the operating Manual.
In addition, the PIN-114 Parallel Interface to PROr·1 Programmer is required. This
consists of a 7507 I/O Module Mounting Rack Inteface Card, an RC50-6 Ribbon Cable,
and th~ 7140 Parallel Interface Adapter. To effect the interface~the 7507 must
be inserted into the STD system rack, the 7140 inserted into the 25-pin "0 connector of the PROM programmer, and the RC50-6 cable connected between them.
11
Data is transferred to and from the PROM programmer via the SND and Rev commands of
the Monitor. The user has the choice of programming PROMs with debugged machine
code directly from the system, or transferring ROM based programs/subroutines into
the system for subsequent modification/debugging.
o
The following diagrams describe the port/bit assignments of the PIN-114:
PORT 52 - Read Data
PORT 50 - Write Data
DO
07
DO
07
••
bi t 7....4F-----------~ bi t 0 bi t 7....""f-----------...,~~ bi t 0
PORT 51- Handshake
TIMIII0 +5v I A lEI R
In
Qut
blt 0
bit 7
All handshake lines are active when low, i.e., 1 = low, 0 = high.
Definitions:
~ = Transfer*
to
M= Mode*
pgmr. I = Interlock*
o = constant
from
pgmr.(
5V = programmer power
A = Address*
E = Error (not used by Monitor)
R = Response*
o
26
o
Monitor Use with M900B or M980 PROM Programmer
The most serious drawback to a RAM based development tool is the volatility
of the memory. All too often, RAM based programs are altered or destroyed by
electrical noise, power fluctuations, or program bugs that overwrite the program.
The M900B and M980 PROM Programmers are equipped with CMOS RAM buffers that provide
short to intermediate, power-off, data retention for several minutes to several
days. These programmers may serve as a separate program storage medium that is
totally immune to the electrical and software bugs that destroy programs.
In order to prevent the total or partial loss of RAM based programs, it is recommended that the user always transfer his program into the programmer buffer before
execution, modification or other debugging. In that way, a copy of the last valid
program can rapidly be reloaded into RAM on request, even after programmer and
system power are lost. It also provides the user with storage for earlier versions
of his program, prior to modifications. Should his modification not work, he can
easily retrieve the earlier version and try a different solution.
Additionally, if the M900B or M980 is equipped with an appropriate interface option
and is interfaced to other systems or I/O devices (CRT, TTY, computers, etc.), the
programmer can serve as a temporary holding buffer. Data can be transferred from
the interfaced device or system to the programmer, then transferred from the prorammer to the Monitor system for debugging or modification.
Monitor Use with M824 or M825 Microprocessor System Analyzer
The user may enhance the execution, debugging and diagnostic capabilities of the
Monitor by combining its application with the added hardware diagnostic capabilities of the PRO-LOG M824 (Z80) or M825 (8085) Microprocessor System Analyzer.
The analyzer performs the following basic functions:
.
a. Tracks the actual instruction sequence as the program executes,
and displays desired address, control and data information when
it occurs.
b. Monitors control states and data passing between the processor and the
system it controls and allows the user to correlate actions or reactions
with program execution.
c. Provides a multi-qualified trigger to conventional oscilloscope when
analog measurements are desireable.
The analyzer allows the user to dynamically monitor his program, single step
instruction-by-instruction or machine cycle-by -machine cycle through the program,
stop the program execution at any address and machine cycle, capture data and
stop the processor after any number of passes through an instruction sequence,
and trigger an non-maskable interrupt upon the occurrence of any program address.
•
The primary debugging capabilities of the Monitor include the ability to execute
any program sequence with known register conditions on entry, and the ability
to set a RAM based breakpoint, at which time the register contents are displayed
and can be altered and execution resumed .
27
When used in conjunction with the analyzer's ability to stop the processor at any
address and after any number of passes through the program sequence, the Monitor
will permit the user to execute and exercise only those RAM and ROM based routines
in which he is interested. This will allow him to independently exercise external
hardware items controlled by the processor system, to diagnose and troubleshoot
hardware problems, and to debug the integration of the software and hardware.
o
Because the Monitor will display the contents of the internal registers upon the
occurrence of a non-maskable interrupt, the analyzer's address-generated interrupt
can be used to effect a breakpoint in ROM or RAM. The user merely sets the breakpoint address on the analyzer switches and arms the interrupt. When that address
occurs on the address bus, the processor will be interrupted and its register contents displayed in the fashion discussed during the explanation of the BPT command.
If the 7303 Keyboard/Display Card is not in place, the non-maskable interrupt routine bypasses the register display routine. Instead the contents of the registers
are pushed onto and pulled off of the stack and a return is executed. To see the
register contents at any program location, place the analyzer in the STOP mode at
location 0000 Hex. Set the desired address on the ADDRESS switches, set the CYCLE
COUNT switch to Ml, the INSTRUCTION COUNT switch to 10 and ADDRESS + INSTRUCTIONS,
and depress the INTERRUPT switch. Now depress CLEAR. The processor will stop at
address 057B Hex and display F5. Single stepping from that point, cycle-by-cycle,
will allow the user to see the registers being stored on the stack. The data displayed will be as follows:
F5, (A), (F), C5, (B), (C), 05, (D), (E), E5, (H), (L), ...
where (r) means the contents of register r. (For a more in-depth discussion of the
analyzer functions and capabilities, see the Users Manual for M824 (M825) System
Ana lyzer. )
0
o
28
MONITOR PROGRAM LISTING
o
FORWARD
The following pages contain the Monitor program listing, main program flow charts,
and pertinent memory maps. The source is written STD mnemonics, and utilizes only
those instructions common to both the 8085 and Z80. An explanation of the mnemonics
can befound on the PRO-LOG STD 8085 or Z80 PROCESSOR PROGRAMMING AIDS cards, in
the USER MANUAL FOR M824 or M825 SYSTEM ANALYZER, and in the PRO-LOG MICROPROCESSOR
USER'S GUIDE. The object or machine code listing is fully compatible for use with
8080A, 8085, and Z80 microprocessors. When provided by PRO-LOG, the program is contained in one Intel 2716 EPROM, or equivalent, and resides in locations 0000 to 07FF.
In addition, the following conventions are used throughout the program listing:
o
a.
Labels enclosed by apprentheses ( ) indicate subroutine entry points.
b.
Labels enclosed by brackets
c.
CST mnemonic implies location is a table data byte, vice instruction.
[J indicate Monitor command entry points.
The flowcharts utilize standard ANSI symbols. The program addresses that correspond to each flowchart element are written above the upper left shoulder of each
sysmbol. If a routine that accomplishes a particular flowchart operation resides
elsewhere in memory (subroutines, etc.) its address is written to the right of the
symbol.
Two memory maps are provided:
a.
2K ROM memory map. This map indicates the relative location in ROM of
each routine, table, and unused area.
b.
1 Page memory map. This map indicates the relative location of each
RAM variable or program parameter assigned for use by the Monitor. It
also shows locations reserved for stack operation. All unassigned RAM
space is available for user programs and data .
•
29
004D
CHECK FOR THE
CLOSURE OF ANY
OF THE FUNCTION·
KEYS.
SET THE
STACKPOINTER.
0800
BLANK
ALL
DISPLAYS.
ROM 1
075B
006D
READ THE KEYBOARD TO IDENTIFY THE FUNCTION SELECTED. 0780
WAIT ~ SECOND
TO ENHANCE THE
DISPLAY VISIBI06AB
LITY.
0040
CLEAR ALL THE
DISPLAY CURSOR
SEGMENTS.
0740
0043
75
READ THE
KEYBOARD FOR
UPPER CASE
FUNCTION.
DISPLAY
II READY?II .
0
0780
MONITOR PROGRAM MAIN FLOWCHART
o
30
YES
9191B5
DISPLAY
"*EDIT*"
FOR ~ SECOND.
YES
091BE
DISPLAY
"*BKPT*"
FOR ~ SECOND.
YES
00C7
DISPLAY
"*EXAD*"
FOR ~ SECOND.
911AE
SET BKPT
01CA
EXEC ADR
0214
DISPLAY
"*SETR*"
FOR ~ SECOND.
00D9
DISPLAY
"*SEND*"
FOR ~ SECOND.
o
YES
E2
DISPLAY
*MOVE*
FOR ~ SECOND.
YES
EB
DISPLAY
*AJAD*
FOR ~ SECOND.
II
II
II
II
SET REG
26F
SEND PGR
0404
MOVE DATA
47A
ADJUST ADR
RESET
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31
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16
DISPLAY
"*FMEM*II
FOR ~ SECOND.
010F
YES
DISPLAY
"*CHAD*"
FOR ~ SECOND.
01F0
EXEC PGM
027B
RECV PGR
03B7
FILL MEM
050B
CHG ADR
0
RESET
32
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RAM VARIABLE MAP
34
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PRO-LOG CORPORATION
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66
1OOOO12m
o
APPLICATION SOFTWARE
MODULE DESCRIPTIONS
The enclosed software module descriptions are intended to provide the user with
all the information necessary to access, utilize or move the routines into his
program. The modules described are totally independent of requirements of the
Monitor program, and are intended to allow the user to fully exercise the capabilities of the 7303 Keyboard/Display Card. There are several other modules
available to the user that are not described herein, because they were written
to the specifications and tailored to the needs of the Monitor program. The
user is encouraged to study the listings carefully, should he find it desireable to utilize those modules.
o
o
67
fIollJLE NAME :_{_ME_S_SA_G_E)_ _ __
ENTRy
~680
AooRESS: _ _ _ _ __
FuNCT lOOAL DESCR I PTI ON :
o
This module allows the user to display a message in the alpha-numeric displays
of the 7303 Keyboard/Display Card. The message can be any length and is displayed in a billboard fashion, i.e., the message moves accross the display
from right to left. A new character appears at the right each 200 milliseconds,
and an old one disappears at the left. The message must be stored in memory,
and can be any length. The first character of the message should be at the low
address in the designated memory space and the end of the m!ssage at the high
address. The message is stored as a string of 8-bit ASCII characters with parity
bit either 1 or 0. The message body should be preceded by a string of 8 ASCII
spaces and also followed by a string of 8 spaces. The last character of the
message must be an FF Hex.
ENTRY
REQU IREMENTS :
Enter this module with the address of the first ASCII space that precedes the
message in the HL register pair.
MEMORY SPACE OCCUPIED:
MEMoRY REQUIREMENTS:
0680 to 069E
roM:
31
ReGISTERS ALTERED BY THIS ROUTINE:
PROGRftM
(200
BYTES
RAM: ___ BYrES
All registers are altered.
o
fJbOOLES UTILIZED BY THIS ROUTtNE:
MSEC 6T), (DISPLAY)
ADDITIONAL CCM1ENTS:
o
68
•
(1 SEC~T); (500 MSEC AT);
f1lWLE N.AME: (200 MSEC ~ T)
06A8;
ENTRY AnDRESS: 06Bl
06AB;
-------
fuNCTIONAL DESCR I PT ION:
These modules provide the user with delays of 1 second, 500 milliseconds, and
200 milliseconds duration. The timing is approximate and based on the clock
rates provided on PRO-LOGls 7801 8085 CPU Card. For users of the 7803 zao
CPU Card, the delays are approximately 1.25 seconds, 625 milliseconds, and
250 milliseconds duration.
ENTRY REQUIREMENTS:
None.
MEMORY SPACE OCCUPIED:
c
MEMoRY REQUIREMENTS:
REG ISTERS AI-TERED
PROGRAM
06AB to 06B6
roM:
15
BY THI S ROUT INE :
BYTES
B, C
MJOOLES UTILIZED BY THIS ROUTINE:
(LONG AT)
ADDITIONAL C(M1ENTS:
•
69
PPM: _ _ BYrEs
ft\)OOLE NAME:
(FLASHER)
ENTRY AooRESS:
0700
-------
o
FUNCTIONAL DESCRIPTION:
This module causes the user's desired cursor pattern to be displayed over the
last displayed data or message for approximately 200 milliseconds (250 msecs.
for ZBO). All cursor segments are then turned off for approximately 500 milliseconds (625 msecs. for Z80). The last displayed data or mes.sage is not changed.
When the cursors are on, all LEO's are also turned on, then turned off when the
cursors are removed. The module can be used to flag the attention of an operator
to the displayed message with a blinking pattern, by access;ng this module in a
repetitive loop.
ENTRY
REQU IREMENTS :
Enter this module with the desired cursor pattern as an 8-bit value in register o.
Each bit (0-7) corresponds to a display position (0-7). If the bit is 1, the cursor
segment is turned on; if the bit is 0, the cursor is turned off.
MEMORY SPACE OCCUPIED:
MEMoRY
REQU IREMENTS:
REGISTERS
PROGRftM
0700 to 0714
roM:
21
ALTERED BY THIS ROUTINE:
BYTES
RAM: ___ BYTES
o
A,F
}'bWLES UTILIZED BY THIS ROUTINE:
(CURSORS), (CLRCURSORS), (200 MSEC .6T), (500 MSEC .6T)
ADDITIONAL Cavi1ENTS:
o
70
•
MoDULE
NAME:
(}I718· rJ71A
(DISP 4ASC); (DISP N)
ENTRY ADDRESS :_'P_'_'_'P_ __
RlNCT I OOAL DESCR I PTI 00 :
This multiple-entry module allows the user to display 4 or N (1 to 8) ASCII
characters in the alpha-numeric displays on the 7303 Keyboard/Display Card.
The ASCII data to be displayed must reside in sequential memory locations,
the leftmost character at the low address and the rightmost at the high address.
ENTRy REQU IREMENTS :
Enter this module with the character count (01 to 08) in register C (DISP N only),
the leftmost display position number in the lower three bits of register E,
and the low order address of the display data table in the HL register pair.
MEMoRY SPACE OCCUPIED:
c
rtMoRY
REQU IRe-1ENTS :
REG I STERS
0718 to 0724
roM:
13
ALTERED BY THI S ROUTINE:
BYTES
A, F, C, D, E, H, L
PRoGRAM ]VbOOLES UTILIZED BY THIS ROUTtNE:
(DISPLAY)
ADD ITIONAL
RAM: _ _ BYrES
Cai1ENTS:
•
71
ftbruLE NftME: ___(D_I_SP_2N_HE_X......
) __
ENTRY ADDRESS : _ _
07_2_-7_ _ __
()
fuNCTIONAL DESCRIPTlOO:
This module allows the user to display the data contained in N (1 to 4) memory
locations as 2-digit Hex numbers in the displays of the 7303 Keyboard/Display
Card. The data stored at the low order address is displayed on the r-ight, and
data stored at the highest address is displayed in the leftmost desired positions.
ENTRY REQU IREMENTS :
Enter this module with the number of memory locations to be displayed in register C,
the rightmost desired display position number in the lower 3 bits of register E,
and the low order address of the data in the HL register pair.
MEMoRY SPACE OCCUPIED:
Ma«>RY REQU IRf}1ENTS :
0727 to 072E
roM:
8
PM: ___ BYrES
BYTES
o
REGISTERS ALTERED BY THIS ROUTINE: A, F, C, D, E, H, L
PROGRAM
JVbDULES UTILIZED BY THIS ROUTINE:
(DISP 2HEX)
AnDI.TIONAL CCM1ENTS:
o
72
•
f'bWLE
NPME:
72_F_ _ __
ENTRY AnDRESS : _ _0_
(Dr SP 2HEX)
fuNCTIONAL DESCR I PTlOO :
This module allows the user to display the contents of any desired memory location
in the alpha-numeric displays of the 7303 Keyboard/Display Card. The data is displayed as a 2 Hex digit number in 2 display positions.
ENTRy REQU IREMENTS :
Enter this module with the address of the data to be displayed in the HL register pair,
and the desired rightmost display position number in the lower 3 bits of register E.
MEMoRY SPACE OCCUPIED:
MEMoRY
REQU IREMENTS:
072F to 073F
roM:
17
REGISTERS ALTERED BY THIS ROUTINE:
PRoGfWv1
BYTES
RAM: _ _ BYrES
A, F, D, E, H, L
]VbOOLES UTILIZED BY THIS ROUTINE:
(DISP HEX)
AooITIONAL CCM'1ENTS:
•
73
MbDuLE
NAME:
(CLR CURSORS): (CURSORS)
0740";
0742
ENTRy AonRESS: _
_ _ _ __
FuNCTlOOAL DESCRIPTIOO:
This multiple-entry module allows the user to display different combinations
of cursors in the alpha-numeric displays of the 7303 Keyboard/Display Card.
The cursor character is a display character with all 16 segments turned on.
It can be displayed over existing displayed data, then be turned off without
altering the previously displayed data. Entry at the label (CL~ CURSORS) turns
off all cursors displayed. Entry at the label (CURSORS) causes any desired
pattern of cursors on or off to be displayed in the a display positions. The
pattern is contained in register D as an a-bit binary number. Each bit position
(0 to 7) corresponds directly with the 8 display positions (0 to 7). A bit set
to 1 turns a cursor on; a bit set to 0 turns a cursor off.
ENTRY REQU IREMENTS :
Enter (CURSORS) with the desired cursor pattern in register D: 1
= on; 0 = off.
Enter (CLR CURSORS) directly.
MEMoRY
SPACE OCCUPIED:
MEMoRY
REQU lREMENTS:
0740 to 0759
roM:
26
REG ISTERS ALTERED BY THIS ROUT!NE:
BYTES
RAM: ___ BYrES
o
A, F
PRooP"*1 ]VbOOLES UTILIZED BY THIS ROUTINE:
(STROBE)
AnD ITIONAL Ca-t1ENTS:
For further information about the cursor control, see the 7303 USER'S MANUAL.
o
74
~-
..---..----~.""-.--"~~--".".., - . " . - " " - - - - - -
o
ftbWLE N.AME: __
(B_LA_N_K)_;_(_DI_SP_8)_
ENTRY
AooRESS:_~_75_B_;_~_7S_D_ _
FuNCTlOOAL DESCRIPTIOO:
This multiple-entry module allows the user to display the same character in all
8 displays of the 7303 Keyboard/Display Card.
Entry at the label (BLANK) causes an ASCII space to be displayed, thereby blanking
all 8 displays.
Entry at the label (DISP 8) causes the ASCII character contained in register D to
be displayed in all 8 displays.
ENTRY
REQU IREMENTS :
Enter (BLANK) directly.
in register D.
MEMoRY SPACE OCCUPIED:
C
MEMoRY REQUIREMENTS:
REG I STERS ALTERED
Enter (DISP 8) with the desired ASCII data to be displayed
~75B to ~766
RJM:_~1.....
2 _ BYTES
BY THIS ROUTINE:
R¥1: _ _ BYrES
A, F, E
PRooRN1 fi:>OOLES UTILIZED BY THIS ROUTINE:
(DISPLAY)
ADDITIONAL Cavr1ENTS:
For further information regarding the alpha-numeric display control, see the
7303 USER'S MANUAL .
•
75
MbDULE
NAME:
(DISP HEX); (DISPLAY); (STROBE)ENtRV ADoRESS: 0768; 076D; 0773
FuNCTlOOAL DESCRIPTlOO:
o
This multiple-entry module is the primary display/control routine for the 7303
alpha-numeric displays.
Entry at the label (DISP HEX) causes the least significant 4 bits of Hex data in
register D to be displayed in the display position whose number is contained in the
lower three bits of register E.
Entry at the label (DISPLAY) causes the ASCII data in register D to be displayed in
the display position whose number is contained in the lower three bits of register E.
The ASCII data can be of any parity.
Entry at the label (STROBE) causes the write line one the selected display chip to
be strobed from high to low to high.
ENTRY
REQU IREMENTS :
Enter
Enter
Enter
Enter
(DISP HEX) with the Hex data to be displayed in the lower 4 bits of register D.
(DISPLAY) with the ASCII data to be displayed in register D.
both with the display position number in the lower 3 bits of register E.
(STROBE) with bit 2 of register E set to 0 to strobe, the right 4 displays, etc.
~EMoRY SPACE OCCUPIED: 0768 to 077F
MEMoRY REQUIREMENTS:
roM:
24
REGISTERS ALTERED BY THIS ROUTINE:
PROGRAM
(HEX
BYTES
RAM:
BYrES
o
A, F, D (DISP HEX only)
r~IlJLES UTILIZED BY THIS ROUTINE:
-4-
ASCI I)
AnnlTIONAL CcMvtENTS:
For a more detailed description of the operation and control of the 7303 alphanumeric displays, see the 7303 USER'S MANUAL.
o
76
o
ftbOOLE NftME: (READ 1 KEY); (READ KBD)
ENTRY AnDRESS: 0780; 07 8F
-------
FuNCTIONAL DESCRI PTION :
The 7303 keypad is arranged as a 4 X 6 matrix, with the key faces and positions
numbered in Hex fromm 00 to 17. This multiple-entry module detects, debounces
and encodes a single key closure. Multiple key closures are ignored. Upon exit,
the accumulator, register A, contains the encoded value of 00 to 17 that corresponds to the positional value of the depressed key. After entry into this module,
the keyboard will continue to be scanned for a key closure until one occurs, at
which time it will be processed and the routine exited.
Entry at the label (READ 1 KEY) will cause only a s"ingle key closure to be processed,
i.e., the key must be opened or released befor another closure can be processed.
Entry at the label (READ KBD) will cause the routine to continuously process any
key closure.
ENTRy REQUIREMENTS: None.
MEMoRY SPACE OCCUPIED:
o
~RY
REQU IREMENTS:
REG ISTERS AI-TERED
PRoGRJ\M
0780 to 07CF
roM:_8_O_
BYTES
FM: ___ BYrES
BY THIS ROUTINE: A, F
]VbOOLES UTILIZED BY THIS ROUTINE:
(SCAN KBD): (DEBOUNCE)
AnD ITI ONAl CcH1ENTS:
See the 7303 USERS MANUAL for more detail regarding the operation and control
of the keyboard.
o
77
ftbOOLE
NAME: (SCAN ALL); (SCAN KBO)
0701, 0706
ENTRY AooRESS: _ _ _ _ __
()
fuNCTIONAL DESCRIPTlOO:
This multiple-entry module detects if any toggle switches or keys are closed.
Upon exiting the routine, the zero flag reflects the keyboard/switch status.
If Z = 0, a key or switch is closed.
Entry at the label (SCAN ALL) detects the status of switches, then keys.
Entry at the label (SCAN KBO) detects the status of the keys only.
ENTRY REQUIREMENTS:
MEMoRY
SPACE OCCUPIED:
MEMoRY REQUIREMENTS:
None.
0701 to 070E
roM:
14
REGISTERS ALTERED BY' THIS ROUTINE:
BYTES
R.AM: _ _ BYrES
o
A, F
PRooRAM ftbOOLES UTtLIZED BY THIS ROUTINE:
None.
PooI.TIONAL ~ENTS:
See the 7303 USER'S MANUAL for a more detailed description of the operation and
control of the toggle switches and keypad.
o
78
o
f'bOOLE NftME:
07E0
(HEX --+ ASCI I)
ENTRY AooRESS: _ _ _ _ __
FuNCTlOOAL DESCRIPTlOO:
This module converts the lower 4 bits of register A to an 8-bit ASCII equivalent,
with parity bit set. Upon exit, the converted value is in register A.
ENTRy REQU IREMENTS :
Enter this module with the Hex value to be converted in the lower 4 bits of
register A.
MEMoRY SPACE OcCUPIED:
o
MeMoRY
REQU IREMENTS:
07E0 to 07EC
roM:
13
REGISTERS ALTERED BY THIS ROUTINE:
PROGRPM
A, F
[tOOLES UTILIZED BY THIS ROUTINE:
ADD ITIONAl
FJV4l: _ _ BYrES
BYTES
CcJ.t.1ENTS:
•
79
None.
MoDULE
.
E'N.
rRv ADDRESS: _~7EE
_ _ _ __
NAME: (DEBOUNCE)
fuNCTIONAL DESCRIPTION:
o
This module implements a 20 millisecond (25 msec. for 180) time delay for the
debouncing of switches and keys, although it can be. used for other purposes.
ENTRY REQUIREMENTS:
rtMORV SPACE OCCUPIED:
~RV REQUIREMENTS:
None.
07EE to 07F6
roM:
9
REGISTERS ALTERED BY THIS ROUTINE:
PRooRN1
(LONG
BYTES
Rtt1: ___ BYrES
None.
o
fJbOOLES UTILIZED BY THIS ROUTINE:
~T)
ADDITIONAL CCM1ENTS:
The delay time of this module is based on the clock rates used with the
PRO-LOG 7801 8085 CPU Card. Users of the 7803 180 CPU Card can expect
a 25% increase in the delay time, due to the lower clock rate.
o
80
f1)WLE NAME : _ _(_L_ON_G_~_T_)_ __
o
07F7
ENTRY
AonRESS: _ _ _ _ __
FUNCTIONAL DESCRIPTION:
This module provides the user with a variable time delay routine. The delay is
implemented by downcounting the contents of the BC register pair (16 bits) to
zero. The delay time can be found from the relationship:
6T = 24 NBC t + A t
where t is the state time of the processor, NBC is the decimal co~nt in BC, and A
is the number of state times executed that are not in the delay loop itself.
Therefore, the count for any time delay can be found from the relationship:
NBC
ENTRY
=
6T - A t
24 t
(NBC must be in Hex)
REQU IREMENTS:
Enter this module with the time delay count in the BC register pair as a
16-bit binary value.
o
MEMORY
SPACE OCCUPIED:
MEMoRY
REQIJ IREMENTS:
REG ISTERS
'/J7F7 to '/J7FF
R.1M:_9__ BYTES
ALTERED BY THIS ROUTINE:
PROGRPM f1)OOLES
Ann ITI ONAl
PJYII :_ _ BYrES
B, C
UTILlZED BY THIS ROUTINE: None.
Cc:M1ENTS:
For the 8085, A = 29. For the Z80, A = 31. The longest time delay that can be
handled by this routine is approximately 500 milliseconds, depending on the
processor clock rate .
•
81
o
o
o
•
o
•
o
o
USER'S MANUAL
2411 Garden Road
Monterey, California 93940
Telephone: (408) 372-4593
TWX: 910-360-7082
Telex: 171879
1068218
500
4/82