Epson PX-8 Technical Manual page 285

REV.-A
Pin No. Signal Name
In/Out Function
13
AB4 In Address bus 4
14 AB15 In Address bus 1 5
15
AB3 In Address bus 3
16 DRAO Out DRAM address 0(8)
- -
17
RAS1 Out Low address stroke: RAS signal to RAS.
18
W1 Out Write enable: WE signal to DRAM.
19
AB2 In Address bus 2
20 AB1 In Address bus 1
21
ABO In Address bus 0
22
N/C
-
Not used
23
N/C
-
Not used
24
N/C
-
Not used
-
25 RD
In Read signal
26 CSROM Out IPL ROM chip select signal
-
27 MR Out Memory read signal
- -
28
Z-INT
Out Interrupt request signal to main CPU
- -
29 Z-RF
In Refresh signal from main CPU
30 VC
-
Circuit voltage (+5V)
- -
31 HLTA In Halt signal
-
32
M1 In Indicates that main CPU is in machine cycle
1 (opcode fetch)
- -
33
MRQ
In Memory request signal
- -
34 RSO Out System reset signal resets the whole ma-
chine.
35 DRA3
Out DRAM address 3 (11)
36
N/C
-
Not used
37
N/C
-
Not used
38 DRA 7 Out DRAM address 7 (15)
39 N/C
-
Not used
7-14