Sharp MZ-3500 - Manual (Page 19)

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