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Joined: Wed May 15, 2019 1:17 am
Posts: 21
Hi all, Warren here. I grew up with Apple ][s and I've mainly done software and network admin in my life. Now I'm discovering the hardware side of things. I somehow managed to build my own 4-bit TTL CPU just by nutting things out myself (https://github.com/DoctorWkt/CSCv2), and I'm still amazed that it works.

Along the way I've learned some Verilog, and now I'm discovering things like ROM latencies and propagation delays that I'd never considered before. Still so much to learn.


Wed May 15, 2019 1:37 am
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Joined: Fri Mar 22, 2019 8:03 am
Posts: 209
Location: Girona-Catalonia
Hi Warren,

Welcome to the forums. As you can see from a couple of posts before, I am very new to this forums too. I will be interested to know more and learn from your project, as my set of skills regarding hardware are absolutely basic. As a side note, I also attempt to make my own designed TTL CPU, but in my case it will be a very long journey because I have set a relatively large set of project goals, and I have some health issues that prevent me to work on it for as much as I would like. Anyway, delighted to have someone joining the forums with a particular interest in TTL chips!

Joan


Wed May 15, 2019 1:19 pm
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Joined: Wed May 15, 2019 1:17 am
Posts: 21
joanlluch wrote:
I am very new to this forums too. I will be interested to know more and learn from your project, as my set of skills regarding hardware are absolutely basic. ... Anyway, delighted to have someone joining the forums with a particular interest in TTL chips!

Joan


Joan, if you are also new to hardware and want to build a TTL design, that's exactly where I was a couple of years ago. I'd highly recommend you look at my CSCv2 CPU (and video series).

There's only 12 chips, each one has a specific job and there is very little "glue" logic. The video series builds it step by step, and also explains the concepts behind each section of the build.

Cheers, Warren

Edit: also apologies Joan, I've just read the 7400 TTL CPU thread and I can see you are much more informed than I assumed!!


Thu May 16, 2019 12:47 am
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Joined: Wed Oct 23, 2019 1:52 am
Posts: 3
Location: Sacramento, CA
commodorejohn checking in - I'm around on a variety of vintage-computing forums, particularly vcfed.org, 6502.org, and the IRIX Network forums. Decided to check this place out when I ran across the link on 6502.org, as I've had an interest in DIY CPU projects for some time. Still need to do a lot of brushing up on low-level electronics before I'd be ready to put anything together in hardware, but I've been scheming out a couple instruction set/architecture designs to suit my preferences for a while, and I've gotten to the point of starting to implement one in software...but more on that in a dedicated thread...!

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Wed Oct 23, 2019 2:50 am
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Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1322
Welcome!


Wed Oct 23, 2019 8:38 am
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Joined: Wed Nov 20, 2019 12:56 pm
Posts: 15
Nice to see a familiar name or two here from other forums!

I'm Alastair, I grew up first with a Commodore64 before moving onto an Amiga, so naturally I have soft-spot for 68K assembly language.

I've tinkered a fair bit with FPGAs over the last few years, learning enough of both Verilog and VHDL to hack on the Minimig FPGA Amiga replica project. I seem to be de-facto maintainer of the Turbo Chameleon 64 port of Minimig, and have ported cores to that platform and others, as well as tinkering with various FPGA-based SoC projects.

I forked the ZPU_small CPU a few years ago, and created a flexible variant of that, ZPUFlex, for use as a support CPU in retro-computing FPGA cores.

I'm now in the process of creating my own experimental CPU core from scratch, which I shall post about elsewhere in due course.

I stumbled across this forum a couple of days ago, having first found the OPC CPU series mentioned on Hackaday - my search for more information led me here. I'm especially interested in OPC5 because of its amazingly small logic footprint - it will fit as a supporting CPU where others won't.


Wed Nov 20, 2019 8:40 pm
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Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1322
Welcome! Nice to hear you find the OPC5 attractive, and that it attracted you here!


Thu Nov 21, 2019 9:27 am
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