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 [ 4 posts ] 
 68K Breadboard build 
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Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1640
At http://www.bigmessowires.com/2014/10/29/68k-free-run/ Steve Chamberlin writes about free-running a 68008 on a breadboard:
Quote:
Along the way to this demo, I discovered that reset handling for the 68K is annoyingly complicated. You might think there’s just a /RESET input to the CPU, and you could force /RESET low to reset the processor, but that’s not how it works...


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Sat Nov 01, 2014 4:03 pm

Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1640
Steve has made significant progress, now running EhBASIC at 2MHz:
http://www.bigmessowires.com/2014/11/04 ... g-the-68k/

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Mon Nov 10, 2014 12:42 pm

Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1640
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More progress - the machine now runs Linux!
http://www.bigmessowires.com/2014/11/17 ... readboard/

Quote:
So how much memory does it require to run a super-minimal uClinux system, with an old 2.0 kernel? If you follow my example and put as much as possible in ROM, it needs about 343K of ROM and 312K of RAM, or just 628K of RAM if you’ve got a bootloader that can fill RAM from some external source.


Video at https://www.youtube.com/watch?v=SRdLlaUmmpM
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There's another breadboarded 68k machine running linux at
http://mc68k.blogspot.co.uk/2012/03/uclinux-part-i.html
with a few videos at
https://www.youtube.com/watch?v=GJmPS3jMwD4
(This project gets upgraded into a PCB with a CPLD for glue:
http://mc68k.blogspot.co.uk/2012/05/alc ... -m68k.html)


Tue Nov 18, 2014 2:39 pm

Joined: Wed Jan 14, 2015 2:56 pm
Posts: 8
Location: South Wales, UK
I'm amazed how quick he put that project together.


Thu Jan 15, 2015 3:01 pm
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