Re: 7747 tuning again

[rr <RRauscher@nni.com>]

I've given the emulator a second or two of thought. That could also
be done in the same manner of borrowing part of the bus cycle.

If I do it, it'll be down the road a bit.

BobR.

Mika.Helander@softbit.fi wrote:

> I can imagine that the coupling logic performs write to added RAM chip for
> every C3 RAM read/write so there is always "mirror" of the C3 ram contents
> in added RAM to sent out.
>
> Very nice idea. It puts those "old" C3's to totally different position when
> considering fine-tuning and missing greater frame rate of P4 and later ECMs.
>
> What about putting EPROM emulator to that same card. The idea is to either
> remove or move C3 EPROM to the card in ECM service port where also resides
> either Flash or RAM chip to keep EPROM contents which can be altered by
> using PIC and serial connection...
>
> -Mika
>
> > Bob,
> >
> > Just how are you able to 'dump' 256 some-odd bytes from the
> > 7747 ram?  I was
> > not aware of any 'command' that can be issued via the ALDL
> > port of a 7747 to
> > dump data.

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