1Running ca65 to assemble the ROM
First of all, you will need to have cc65 installed, which will depend on the OS you use. Please see the website of cc65 for more information.
When you use Linux or macOS, I have made a Makefile, which may make life easier. Just run
in the rom directory and you should get a bios.bin file (32 kbyte) which you can burn into a 28C256 (or equivalent).
If you prefer to do it manually, see the commands in the next code snippet
cl65 -t none -l bios.lst -o main.bin main.asm cp main.bin > bios.bin cat main.bin >> bios.bin
I copy the rom twice into the final bios.bin file, as I have not (yet) found a way to burn a smaller binary at a specific offset with the Linux minipro command.
2Soldering the components
I have included (or try to include) iBOM HTML pages for all boards, as to make it easier to find what to solder where