Re: Strange 8255 behavior

From: Michał Pleban <lists_at_michau.name>
Date: Tue, 12 Jun 2018 23:57:54 +0200
Message-ID: <5B2041E2.9010302@michau.name>
Mia Magnusson wrote:

> I would rather suggest using a really fast SRAM (fast compared to the
> CPU clocks used on the 8088 and 6509) and just let both CPU's use the
> same single adress/data interface on the SRAM.

That sounds waaaay more complicated than just placing a dual-port RAM
between the CPUs. You would need to check how the 8088 accesses the RAM,
and if there is any possibility to synchronize it with the 6509. It's
not like a dual-6502 system when the CPUs can be placed in opposite
phases, I suspect that the 8088 is much more complicated and does not
fit easily into the 6502 access model. Or maybe you could do some
abitration where one CPU is given priority and the second is placed in a
wait state, but that's still lots of work. We even don't know whether
the card can be overclocked to 18 MHz at this point.

Regards,
Michau.
Received on 2018-06-13 00:02:39

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