Running at 2MHz - later upgraded to a PCB, running at 12MHz

Sources available: see http://www.bigmessowires.com/68-katy/



Blog post here:
http://www.bigmessowires.com/2014/11/17 ... readboard/
and embedded video at
https://www.youtube.com/watch?v=SRdLlaUmmpM



In the comments we find a link to a previous post about another scratch-built 68k machine, by Luis Alves, which ran up to 16MHz:
http://www.bigmessowires.com/2014/10/27 ... -computer/

Another useful pointer from the comments:


via http://stardot.org.uk/forums/viewtopic. ... 52#p110437

What is the limits for wirewraps?
I'm pretty sure the original Amiga ran with a 28MHz source clock and while the 68K part looked like a pcb the custom chips were all wirewraps and I think the real frequency in use was 7.16MHz?

Wirewrap can go pretty high, I think, but you need to take care at high frequencies (and with high edge rates)

Note though that this is breadboard, not wirewrap, and breadboard is not a very clean electrical environment.

See our sister 6502 forum's sticky on getting good performance in digital designs, with lots of comments on WW, point-to-point wiring, solderless breadboards, custom PC boards, transmission lines, etc., at http://forum.6502.org/viewtopic.php?f=4&t=2029