Re: Ultimax mode VIC II access to external RAM?

From: smf <smf_at_null.net>
Date: Thu, 3 May 2018 09:19:00 +0100
Message-ID: <b6e4a9ed-e47f-39a2-f3a1-c06e6b5938ff@null.net>
On 30/04/2018 13:58, Michał Pleban wrote:

> VIC does not normally see these ROM chips so it will not see RAM
> there as well (except, of course, the area hardwired to $3000).

VICII sees whatever is enabled when it tries to fetch, the PLA only 
enables RAM or  CHARGEN in C64 mode.

In ultimax mode you can supply VICII with external data from ROM, RAM, 
or even procedurally generated data for the unpopulated areas.

I don't believe you can externally override the low 2k in ultimax mode. 
You probably need to do your own address decoding.
Received on 2018-05-03 11:00:02

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