Sharp MZ-3500 User Manual
Page 73
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7-6. I/O port map
8255 ON SUB CPU BUS
M / 3500
PA7
N.
DATAS '
PA6
DATAT
i‘A5
DATAS
PA4
DATA 5
PA3
Output
DATA4
8255
CÌ
PA2
DATAS
Printer
chip address(CX)11 /xxxx]
oc PAI
DATA2
>
PAO
>
DATAI
PC7 OBF outpu
ACK T-SET
Group A: Mode 1
Group B: Mode 0
PC6 ACK inputi
ACK
PC 5
N
STROBE
^
PC4
MUS 1 C , sustain
PC3
INTR
NOT USE
PC 2
N
ACKC
'
PCI
STC
Keyboard
PCO
DC
PB7
P/M
CG selection
O
PB6
SRDY
Sub CPU READY
oc
T3
PB5
Output
CLK
ro
PB4
Din
PB3
C2
Clock
PB2
CI
PBl
CO
PBO
STRB
-
INPUT PORTC74LS2443
CDS7 :
HLT KEY
74LS244
CDS6D
STK D
Keyboard
port addressÌOlOO/xxxx]
CDS5D
DK
J
CDS4D
PDTR -1
CDS33
PE
Printer
CDS23
BUSY J
CDSl 3
Reads the 8255 OBF (PC7)
COSO 3
output or timer output.
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