Download Ipso Facto Issue 18

P~GE:
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PLOT:
*
*
EIGHT F'OLD MIRROR
SYMMETRY
+--> Y
I
I
I
I
(cycle time Kaleidoscope
2S6x2S6 display!)
V X
*
25
*
*
(y-x,u-y)
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PLOT: (y-x,y-y)
(u-x,y-5)
(x-S,u-y)
(x-S,y-S)
(u-y,u-x)
(u-Y,x-S)
(y-S,u-x)
(y-S,x-S)
*
*
>
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A Hardware Bug in the 1802
G. Pick
Box 1023,
Botwood, Nfld.
If your system uses interrupts and you are also outputting data
using R2 as your X register, you may find the data at M(R(X» destroyed
under certain circumstances.
The following section of a telemetry program brought
to my attention.
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00
01
02
03
04
05
06
07
08
09
OA
OB
OC
00
OF'
10
11
12
13
14
Bsel
[
DB
32
]
F'D
02
3B
[00]
Alarm
63
22
22
6B
64
22
F'8 00
52
63
37
[00]
30
[01]
this
Call hex keybd inp. sub.
B2 exit -- exit this function
if input = '00'
SDI
02 -- Do not accept input over 02
BNrSsel
Out 3 Output bank select data
Dec. R2 Point R2 to clear area
Input 3 Input alarm data
Output alarm data to display
Dec R2
LDI 00
Str R2 - output 00 to reset alarms
Out 3
84 - Br. to input rtn. if 'input' on
Ssel
Br to Alarm - Output bank select again
problem