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 Cambridge-1 
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Joined: Mon Aug 14, 2017 8:23 am
Posts: 157
Whilst at the Retrocomputer Festival in Cambridge last weekend, I shared a corner of the room with Richard J. Grafton of Arith-Matic.

Richard had spent 30 days in August building a 4-bit breadboarded TTL computer he calls the Cambridge-1.

It's a neat design, which currently uses an Arduino for program loading - but this is to be replaced later with some more TTL logic.

There's some detais on Github here https://arith-matic.com/notebook/4bit-7 ... mputer-cpu

and an introductory video here: https://t.co/Y3vSw8jCUs?amp=1

Richard has posted his progress to Twitter under the @arith_matic handle

https://twitter.com/arith_matic/status/ ... 7821462530


Sun Sep 15, 2019 3:17 pm

Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1647
Nice one! I trust you had a good weekend at the event. I was only recently checking out Arith-Matic's work and there was no CPU at that time, only an ALU. I'd like to post this over on the Retrocomputing Forum - unless you'd like to!


Sun Sep 15, 2019 3:46 pm

Joined: Mon Aug 14, 2017 8:23 am
Posts: 157
Hi Ed,

Richard has been burning the midnight oil for about a month to get the Cambridge-1 together in time for last weekend's RC Festival.

Using an Arduino to help with the Bring-Up is a neat idea ( and also covered well in Ben Eater's latest video on the 6502 https://www.youtube.com/watch?v=LnzuMJLZRdU )

Richard also told me that the Cambridge-1 is a Bitslice architecture and so it should not be too difficult to extend to 8,12,16 bits.

Please share with our friends at Retrocomputing Forum.


Cheers,


Ken


Sun Sep 15, 2019 3:52 pm

Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1647
Thanks, shared. This certainly is an interesting machine, and the mission of teaching the lowest levels of computing is a very worthy one.


Sun Sep 15, 2019 4:15 pm
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