Task:
"I intend to (Fix first) and then Modify a ZX Spectrum Light-gun to work on a Dragon 32, and then explore if a simple game or demo could be written. If all goes well (or badly) I may see what I can do with it on the ZX Spectrum."
Progress...
Date: 10 October 2024
The fixing was easy, it was the cable and all worked well on the Spectrum.
The next step was to see if the electronics worked on 5V as the Spectrum was using 12.
According to the scope traces it looks like it did switch, and so confidently I wired it straight up for a Dragon Joystick port.
AND, it didn't work!
In the process of wiring it up to a DIN connector I messed up the connector a fair bit and I now need to wait for a new one, so I can break it out and investigate further.
Hopefully I can get some pictures in here to make this more interesting soon.
Fixing and measuring the 12V signal
Badly soldering the Din connector
The light sensor needs to use the digital fire signal.
Using M/C testing the light sensor.
The fire button needed a pulldown resistor to work on the Analogue channel.
Moving away from breadboard.
Once back together, seems I need a bright screen for it to work.