Buster 11 is working

[Zac67]

Nope - just a single Super Buster (various revs though). Guess the one that didn't work was just dead.

[Zac67]

It's pretty easy to change a 16 MHz machine to 25 MHz. Nothing more than exchange the oscillator clock and move a few jumpers. The CPU/FPU may be rated at 16 MHz but MC parts were qualified at double(!) clock speed.

[Zac67]

Hmm, so this applies to to the 25Mhz machines too? We could go to 50Mhz?

In theory. It's not just the CPU/FPU combo that'd be running at that speed.

The jumpers that need to be moved from 16 to 25 MHz add wait states for ROM and RAM which wouldn't be able to respond within 40 ns. But there's no setting for clock speeds beyond 25.