looking to replace amiga 500 keyboard with custom mechanical board

I just bought (as-is, as a project) an A500, and found out the keyboard membrane was removed by the (or A) previous owner. I have a layout ready, and a PCB in design, but I can't seem to be able to find how the membrane matrix is laid out. if anyone can help me with that, I can trace my PCB accordingly and use the original controller board (or at least components). if not, can anyone help with info to program a µC to interface correctly with the A500?

I have PCBs in design for each of these, I'm leaning toward the ANSI layout though.

Ansi


BigAssEnter


ISO

The keyboard matrix can be found in the hardware reference manual.

You'll also need the pinout of the keyboard controller (DIP version) (A500 column).

PC0-PC7 and PD0-PD7 (controller) obviously correspond to PC.0-PC.7 and PD.0-PD.7 (matrix)

PB0-PB7 and PA0-PA1 (controller) are directly explained.

So this leaves PA2-PA7 (controller) to correspond to Row0-Row5 (matrix), obviously in that order as Row0 is subtitled "bit2" (hinting PA2) etc up to Row5 / "bit7" (hinting PA7).


You can google "amiga keyboard membrane" for routing ideas, maybe you can find better quality photos.

I personally don't like the ANSI, the control key is in the "wrong" place, muscle memory ingrained since 1991 make my fingers go for Ctrl Amiga Amiga quite naturally. I personally prefer the ISO but then I own an A500+ so am used to the two blank keys.

Currently my right shift is not working and will eventually look into sorting that out, but for the right price I would consider a new keyboard but only if it had Amiga keys or perhaps Boing Ball keys.