Motherboard connectors pinouts  > obsolete computers pinouts

 

Pin
Number
Pin
Name
Description (may be empty)
1 +5V  ->
2 +5V  ->
3 GND  
4 GND  
5 XDRD0  <-> memory expansion data word
6 XDRD1  
7 XDRD2  
8 XDRD3  
9 XDRD4  
10 XDRD5  
11 XDRD6  
12 XDRD7  
13 XDRD8  
14 XDRD9  
15 XDRD10  
16 XDRD11  
17 XDRD12  
18 XDRD13  
19 XDRD14  
20 XDRD15  
21 GND  
22 GND  
23 A8  -> address lines
24 A7  
25 A6  
26 A5  
27 A4  
28 A3  
29 A2  
30 A1  
31 A0  
32 ~EXRAM <- to activate mem expansion, connect to GND
33 GND  
34 GND  
35 ~CASL  -> ~CAS for the low byte
36 ~CASH  -> ~CAS for the high byte
37 ~RAS0  -> (by default used by internal mem -- depends on JP3)
38 ~RAS1  -> ~RAS for external memory -- depends on JP3
39 ~WE  -> write enable
40 ~CCK  -> (some clock signal...not used by standard memory expanders)
41 XD0  <-> data lines to real-time clock ( M6242B )
42 XD1  
43 XD2  
44 XD3  
45 XA0  -> addres lines to real-time clock
46 XA1  
47 XA2  
48 XA3  
49 ~XCLKRD  -> external clock read (read date/time)
50 ~XCLKWR  -> external clock write (set date/time)
51 +5V  ->
52 +5V  ->
53 GND  
54 GND  
55 +12V  ->
56 -12V  ->

(Directions relative to computer.)

 

You can also identify the pins on the expansion board by holding it with components up and the connector at the right side: pin 1 - top left, pin 2 top right...


unknown connector
at the computer side
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