All connectors are shown as seen looking into the board.
For suitable backplanes refer to current catalogue.
!DACK2 10 o o 9 GND EOP 8 o o 7 GND AEN 6 o o 5 GND nc 4 o o 3 GND TIMO 2 o o 1 GND
These are shown as seen looking into the front of the board.
3 nc 5 5V 2 Keyboard data (TTL) 4 0V 1 Keyboard clock (TTL)
1 nc 2 5V 3 Keyboard clock (TTL) 4 Keyboard data (TTL) 5 0V
1 nc 2 5V 3 Keyboard clock (TTL) 4 Keyboard data (TTL) 5 0V
1 Switch 2 0V
1 5V 2 Speaker 3 0V
The speaker should be connected between +5V and the centre pin of LK2, as the speaker is open-collector driven.