Re: SuperPET 6702 IC

From: David Roberts <daver21145_at_gmail.com>
Date: Sat, 31 Dec 2022 22:10:24 +0000
Message-ID: <CAC5emFGT2nBJv_BM8CH_V-6gRL17SV6Rkp2e2vV2ELgfo-PyeQ_at_mail.gmail.com>
I thought I had commented the transistor schematic as to how it 'worked'. I
will double-check myself tomorrow...

This is pretty much 8 parallel shift registers each consisting of 8 bits.
The registers can be preloaded.

Each chain of registers can be shortened from 8 bits and there is the usual
"end around shift" with an xor gate.

Dave

On Sat, 31 Dec 2022, 22:00 Jim Brain, <brain_at_jbrain.com> wrote:

> On 12/31/2022 5:11 AM, David Roberts wrote:
> > Not to my knowledge.
> >
> > But the schematics are on my Google drive and it is a very simple
> circuit.
> I thought it might be a neat evening exercise, but I wasn't sure where
> the schematic was on the list of docs.  I saw the actual transistor
> logic in a PDF, but that's a bit low level to easily convert to
> Verilog/VHDL.
> >
> > You will not end up with the volatile nature of the 6702 if you slow
> > the clock down - but who cares?
> >
> > The correct implementation of the 6702 was embedded into VICE.
>
> Maybe that's an easier path fo HDL conversion.
>
> Jim
>
>
Received on 2023-01-01 00:02:50

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