Re: Max Chips..

From: Spiro Trikaliotis (Spiro.Trikaliotis_at_gmx.de)
Date: 2000-09-28 17:50:01

Hello,

Marko Mäkelä wrote:

> But doesn't the UltiMax memory configuration in the C64 have 4 kilobytes
> of RAM ($0000-$0fff)?  Or maybe the Commodore engineers thought that the
> 64 would be compatible enough; it wouldn't be necessary to map the
> addresses $0800-$0fff to $0000-$07ff.

Well, my PRG tells me that in UltiMax mode of the C64, the C64 _ignores_ the 2
KB extra RAM of the cartridge. So, I _think_ that the memory configuration is as
follows:

The UltiMax (VIC-10) has 2 KB, going from $0000-$07FF. There are cartridges
which have 2 KB of extra RAM, fitting into $0800-$0FFF. AFAIR, (at least) one
line of the UltiMax cartridge port has another name than the corresponding line
of the C64 cartridge port, that line (or one of these) is used as CS for the
external RAM.

The C64 just uses its own memory for that matter, so that external RAM is
ignored.

Yours,
   Spiro.

--
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Spiro R. Trikaliotis            Otto-von-Guericke-Universitaet Magdeburg
Phone: +49 (0)391 67-12560                     Fakultaet fuer Informatik
Fax:   +49 (0)391 67-11161               Institut fuer verteilte Systeme
EMail: spiro@ivs.cs.uni-magdeburg.de   Echtzeitsysteme und Kommunikation
http://ivs.cs.uni-magdeburg.de/EuK/             PF 4120, 39016 Magdeburg
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