Switch and Lamptester for 'the bench'

Designed for Williams System11 but, with some rewiring, can be used for SYS3..7 also.

Add jumpers to the switchtesters on switches you want to have permanently closed.

Add 8 resistors of 2,2K .. 4,7K depending on how 'intense' you want the LEDs.

Both Switch and Lamptester when they come preassembled from JLCPCB

both testers 'in action' on WillFA11 (emulated game: Highspeed)

documentation

For System11 you can use Molex 1:1 connectors e.g. from Aliexpress here

For System7 you need to change some wires, see tables below. Pins marked green can be left 'in place', pins marked orange need to be changed.

For the Lamptester to work you need to add Lamppower to Lamp GND (2J6) and Lamp Power (2J4) on the CPU. Williams do have 16Volt DC here, but the LEDs on the tester are working with anything >=5Volt.