Re: Ultimax mode VIC II access to external RAM?

From: Michał Pleban <lists_at_michau.name>
Date: Fri, 04 May 2018 12:35:29 +0200
Message-ID: <5AEC3771.3070400@michau.name>
Hello!

smf wrote:

> IO2 doesn't exist at all on the Ultimax, IIRC it's used for a cia shift
> register pin.

No, it is used as a CIA chip select signal. CIA CNT and LD pins are
where the /GAME and DOTCLK signals are on the C64.

> IO1 seems to be the same $DE00 select on the Ultimax and C64, you could
> put RAM there but it's a bit out of the way.

No, IO1 _is_ the external RAM select in the Ultimax.

> I'd like to see a Max basic cartridge, but I'm guessing that it used
> it's own decoding. It's super trivial to and/or a few lines together.

No, see above.

Regards,
Michau.
Received on 2018-05-04 13:00:03

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