Last visit was: Fri Sep 17, 2021 9:57 pm
It is currently Fri Sep 17, 2021 9:57 pm



 [ 4 posts ] 
 68 Katy – 68000 Linux on a Solderless Breadboard 
Author Message

Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1632
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


Wed Apr 22, 2015 10:25 am

Joined: Thu Jan 17, 2013 4:38 pm
Posts: 44
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: 1632
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 http://forum.6502.org/viewtopic.php?f=4&t=2029

_________________
http://WilsonMinesCo.com/ lots of 6502 resources


Wed Apr 22, 2015 7:55 pm WWW
 [ 4 posts ] 

Who is online

Users browsing this forum: AhrefsBot, CCBot, Google [Bot] and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software