Download DECUS_PC-SIG_Symposi.. - Chicago Classic Computing

p 0 RI
A
p 0 RI
o HALF DUPLEX
B
SUPERSET OF BASE COMM PORT
o TRANSMIT ·CLOCK 721.6 KHz
- DMA CAPABILITY
o DATA AND CLOCK LEADS
- DIE TRANSMIT CLOCK
o DEDICATED DMA CHANNELS
- IDLE LINE DETECTION/GENERATION
o RS-422 ELECTRICAL INTERFACE
- CLOCK SUBSTITUTION FOR CRC COMPLETION
o DB-9 CONNECTOR
...0
ADDR E S S
AS S I G NME NT S
8 2 3 7 AI! I! BEs s AS S I G NME NT S
P 0 RI
DE S C R I p I I 0 N
P 0 RI
60-67
#
#
llA...Il
COUNT &ADDRESS
RI I E
BASE &CUR. ADD.
DMA STATUS REG.
COMMAND REGISTER
lt
20
PORT B COMM CONTROL/STATUS
21
PORT B CLOCK GENERATOR
68
22
DMA INTERRUPT CLEAR
69
REQUEST REGISTER
23
OPT! ON RESET
6A
SINGLE MASK REGISTER Bll
28
7201 CH. ADATA
6B
MODE REGS ITER
29
7201 CH. B DATA
6C
CLEAR BYTE POINTER F/F
2A
7201 CH. ACMD/STATUS
6D
2B
7201 CH. B CMD/STATUS
6F
MASTER CLEAR
TEMP. REGISTER
ALL MASK REGISTER BITS
...
.