M/.3500 – Sharp MZ-3500 User Manual
Page 19
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M/.3500
Pm No
Polarity
Signal Name
IN/OUT
Function
57
SYSR
IN
System reset signal.
Used to reset I/O port in the MMR.
(System Reset)
58
FD3
IN
Input from the sytem assignment dip switch.
•$ee the dip switch description, provided separately.
59
COAB
IN
Shared RAM select signal.
Address of the shared RAM is i?F800-#FFFF
for
the main
CPU
(Common RAM Address)
60
R01B
OUT
Select signal for 8KB area allocated to slot 1.
Valid when SD2 is active (ROM based BASIC) and SD3
(RAM based BASIC)
(ROM 1)
61
GND
IN
Ground
62
Vcc
IN
5V supply
63
64
R02B
R03B
OUT
Select signal for 8KB area allocated to slot 2 or 3.
Valid when SD2 is active (ROM based BASIC) and SD3
(RAM based BASIC).
(ROM2, 3)
65
RDB
IN
Read signal from the main CPU.
(Read)
66
CLK
EAIT signal generation clocit.
(Clock)
67
R04B
OUT
Select signal for 8KB area allocated to slot 4.
Valid when SD2 or SD3 (RAM based BASIC) are active.
(ROM 4)
68
MPX
OUT
RAS/CAS address switching signal for the main CPU DRAM.
High: Row address Low: Column address
(Multiplex)
69
GND
IN
Ground
70
CASB
OUT
CAS (Column Address) signal for the main CPU 64K DRAM.
•Refresh for the RAM only.
(Column Address Select Buffer)
71
GND
IN
Ground
72
INTB
OUT
Interrupt signal to the main CPU.
(Interrupt)
73
Not used