Epson PX-8 Technical Manual page 166

REV.-A
3.2.3 Interface Signals
The RAM disk unit is connected to the Main Frame board via a cable assembly
#
727. Table 3-3
lists the interface signals.
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5
4
0
9
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~~----------~.~4=2
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Table 3-3. RAM Disk Unit Interface Signals
~
Pin Signal
Direction
Pin
Signal
Direction
No. Name
Definition
No.
Name
Definition
1 - -
Not used. 2 -
-
Not used.
3 - -
Not used. 4 - -
Not used.
5 AB1 Input
Address but line 1 6 AB2 Input
Address bus line 2
7
-
-
Not used 8 ABO Input Address bus line 0
9 AB4 Input
Address bus line 4 10 AB3 Input Address bus line 3
11 AB6 Input
Address bus line 6 12 AB5 Input Address bus line 5
13
-
-
Not used. 14 AB7 Input
Address bus line 7
15
- -
Not used. 16
-
- Not used.
17
DBO
Input!
Data bus line 0 18 DB1
Input!
Data bus line 1
Output
Output
19 DB2
Input/
Data bus line 2 20 DB3
Input/
Data bus line 3
output Output
21 DB4
Input/
Data bus line 4 22 DB5
Input/
Data bus line 5
Output Output
23 DB6
Input/
Data bus line 6 24 DB7
Input/
Data bus line 7
Output Output
25
- -
Not used. 26
-
-
Not used.
27 - -
Not used. 28
- -
Not used.
29 VL Input
Logic circuit +5V supply 30
- -
Not used.
31 GND
-
Signal ground 32 GND
-
Signal ground
33 RS Input Reset 34
-
-
Not used.
35 RD Input Read 36
-
-
Not used.
-
37 WR Input Write 38
- -
Not used.
39 VCH Input Battery charge voltage 40 10RQ Input I/O Request
41 DCAS Input Cata CAS 42 DW Input Data Write
43
- -
Not used. 44 OFF Input GAH40D Initialization
45 -
-
Not used. 46
-
-
Not used.
47 VB1
Input Battery voltage 48
- -
Not used.
49 - -
Not used. 50
- -
Not used.
Note:
Some of the signals used in the Main Frame including the address bus lines AB7 through
AB15, etc. are not used in this interface.
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