I'm pretty sure there's a little microcontroller built into the Mac Plus keyboard. Nothing short of connecting it to a Mac Plus or other compatible machine is really going to confirm that the MC is working properly.
So this got me curious. I did a little search and found one source which claimed that the Mac Plus keyboard contains an Intel 8021 MC and another source which says it contains an Intel 8049. They're both from the same family and the only difference is the amount of mask ROM and the number of IO pins available.
It would be interesting to hack the thing and read the contents of the program memory, to know exactly how the keyboard is meant to work. I think I'll go post that in Hacks as a suggested project. I'd add it to my list, but why bother? I'll never get to it...
So this got me curious. I did a little search and found one source which claimed that the Mac Plus keyboard contains an Intel 8021 MC and another source which says it contains an Intel 8049. They're both from the same family and the only difference is the amount of mask ROM and the number of IO pins available.
It would be interesting to hack the thing and read the contents of the program memory, to know exactly how the keyboard is meant to work. I think I'll go post that in Hacks as a suggested project. I'd add it to my list, but why bother? I'll never get to it...