Re: Strange 8255 behavior

From: Michał Pleban <lists_at_michau.name>
Date: Sun, 10 Jun 2018 19:00:08 +0200
Message-ID: <5B1D5918.5070503@michau.name>
Gerrit Heitsch wrote:

> Another Idea would be to use an AM2130 (datasheet is available online)
> or similiar chip instead if you can find them. That's a 1k x 8 dualport
> RAM with built in arbitration. Should be perfect to interface 2 systems.

That sounds like a cool chip!

But a problem here is that the 6509 interface routines are placed in the
KERNAL. So the card should be compatible with the existing hardware
which uses 6526. The routines could be rewritten and placed in RAM, but
then the original MS-DOS will not work with the new card.

Regards,
Michau.
Received on 2018-06-10 20:00:04

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