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68 Katy – 68000 Linux on a Solderless Breadboard
http://anycpu.org/forum/viewtopic.php?f=23&t=217		 Page 1 of 1
Author:  BigEd [ Wed Apr 22, 2015 10:25 am ]
Post subject:  68 Katy – 68000 Linux on a Solderless Breadboard
Running at 2MHz - later upgraded to a PCB, running at 12MHz

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

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

Image

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:
Quote:
This old Motorola app note also presents a 68008 minimal system that you may find useful: http://ferretronix.com/tech/68k/an897.fsl.d.rev0.pdf


via http://stardot.org.uk/forums/viewtopic. ... 52#p110437
Author:  NorthWay [ Wed Apr 22, 2015 6:11 pm ]
Post subject:  Re: 68 Katy – 68000 Linux on a Solderless Breadboard
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?
Author:  BigEd [ Wed Apr 22, 2015 6:57 pm ]
Post subject:  Re: 68 Katy – 68000 Linux on a Solderless Breadboard
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.
Author:  Garth [ Wed Apr 22, 2015 7:55 pm ]
Post subject:  Re: 68 Katy – 68000 Linux on a Solderless Breadboard
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
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