Version 1

This is the first release of this project. It has some issues, see below.

This version has been tested on an A500, A600 and A2000. I have used an M27C800-100F1 EPROM by ST and an SN74HC00 gate. While I don't recommend using parts from the HC series, functionality-wise the board works perfectly. The 100ns EPROM seems to be fast enough. Of course you are free to use faster EPROMs, but I would suggest to stay away from 150+ models: while they may still be fast enough, I can't guarantee that.

Since I am a Linux guy, I created the EPROM image file like this:

cat diagrom.bin kick13.rom kick31.rom | dd conv=swab of=oks.bin

256 KB ROMs go first and the 512 KB ROM goes last (See #1 for a 256 KB diagrom.bin). The files I used were in "UAE" format, that is low-endian. The dd bit will byte-swap the output file, so that it is big-endian and ready to be flashed on the EPROM as-is.

Now, to the bad news: the board has some physical issues that make it hard to fit in A500 and A600 computers. On the A500, the top shield will lean against the board, so it is recommended to put insulation tape on the contact point. The keyboard will also be slightly lifted wrt its normal position. You can manage to close the case, but it will be somehow crammed.

On the A600 the keyboard just won't fit.

On the A2000 it fits just nicely.

I'll think about a redesign of the PCB for the next release.