Sharp MZ-3500 - Manual (Page 73)

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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