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 [ 4 posts ] 
 68 Katy – 68000 Linux on a Solderless Breadboard 
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Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1789
Running at 2MHz - later upgraded to a PCB, running at 12MHz

Sources available: see

What does it take to build a little 68000-based protoboard computer, and get it running Linux? In my case, about three weeks of spare time, plenty of coffee, and a strong dose of stubborness.

Blog post here: ... readboard/
and embedded video at


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: ... -computer/

Another useful pointer from the comments:
This old Motorola app note also presents a 68008 minimal system that you may find useful:

via ... 52#p110437

Wed Apr 22, 2015 10:25 am

Joined: Thu Jan 17, 2013 4:38 pm
Posts: 54
BigEd wrote:
Running at 2MHz

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?

Wed Apr 22, 2015 6:11 pm

Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1789
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.

Wed Apr 22, 2015 6:57 pm

Joined: Tue Dec 11, 2012 8:03 am
Posts: 285
Location: California
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

_________________ lots of 6502 resources

Wed Apr 22, 2015 7:55 pm WWW
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