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/
3500
7-6.
I/O
port
map
8255
ON SUB CPU BUS
IN
OUT
8255
chip
address(0011/xxxxj
Group
A:
Mode
1
Group
B:
Mode
0
O
3
PA7
PA6
i'A5
I'A4
I'A3
PA2
PA1
PAO
PC7
PC6
PCS
PC4
PCS
PC 2
PCI
PCO
PB7
PB6
PBS
PB4
PBS
PB2
PB1
PBO
Output
OBF
output
ACK
inputi
1NTR
Output
DATA8
DATA"
DATA6
I)
AT
A
5
DATA4
DATA3
DATA2
DATA1
ACK
T-SET
ACK
STROBE
J
MUS
1C ,
sustain
NOT USE
ACKC
STC
DC
P/M
SRDY
CLK
Printer
Dm
C2
Cl
CO
STRB
Keyboard
CG
selection
Sub CPU
READY
Clock
INPUT
PORTC74LS244
74LS244
port
address[0100/xxxx]
IN
OUT
#4X
CDS7D
CDS6D
CDS5D
CDS43
CDS33
CDS2D
cosn
CDSOD
HLT KEY
STK -i
DK
J
PUTR
PE
BUSY
Reads
the
8255
OBF
(PC7)
output
or
timer output.
Keyboard
Printer
-
80-