Pinouts >  Keyboard, Mouse and other input devices cables and adapters scheme
25 pin D-SUB male connector layout
25 pin D-SUB male connector
at the back
Concept Keyboard A4-128 Keyboard

 

Pin
Number
Pin
Name
Description
1 USER PAD  (N/O Hardware button above keyboard)
2 USER PAD  (N/O Hardware button above keyboard)
3 DATA BIT 7  MOST SIGNIFICANT BIT
4 NOT USED   
5 GROUND   0v
6 DATA BIT 6   
7 DATA BIT 5     
8 DATA BIT 4   
9 DATA BIT 3   
10 DATA BIT 2   
11 DATA BIT 1   
12 DATA BIT 0  LEAST SIGNIFICANT BIT
13 NEGATIVE STROBE   
14 POSITIVE STROBE   
15 RS422 OUT A   
16 RS422 OUT B   
17 RS232C/V24   
18 CURRENT LOOP POSITIVE   
19 CURRENT LOOP NEGATIVE   
20 RS423   
21 NOT USED   
22 NOT USED   
23 NOT USED   
24 UNREGULATED INPUT
8-12v
  
25 +5v SUPPLY   +/- 0.25v

 

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Concept Keyboard A4-128 visual pinout:click to enlarge
Source(s) of this and additional information: http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/ConceptKbd_A4-128.html
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