Cool. What is the thing hiding under the keyboard with the 3 cables going to it? Does the third cable go into the RF modulator or to a separate socket? And the thin, red/yellow twisted cable pair?
What is on top of the rectifiers on the power board, to the left of the power switch?
The red led comes on. The relays click on reset/power cycling which is as I remember. The thing under the keyboard is an external switch to select the higher res graphics mode (from memory GO80 or something). Yes the third cable goes to the RF modulator. The twisted pair goes to an LED mounted on the top case above the keyboard. Confirms the board is on. Here's a few more images.
From memory I think the final mod was taking the Printer A port to an external connector. I had some traffic light LEDs and intersections that I programmed as a boy.
So where do I send it to? I have no means of checking the video output - the monitor has long ago been recycled.
... too many ideas and too little time ... Related stuff written in Python:
Dragon 32 emulator / PyDC - Python Dragon 32 converter: https://github.com/jedie/DragonPy
DWLOAD server / Dragon-Lib and other stuff: https://github.com/6809