Re: VIC-20 mega expansion memory map (was Re: Looking for one Am29F032B in SO44 case)

From: Anders Carlsson (
Date: 2003-01-24 09:01:48

On Fri, 24 Jan 2003, Ethan Dicks wrote:

> I'll name one: my port of Zork from the C-64 to the VIC-20.

Nice. Does it run in 22 columns, or did you expand the width somewhat
to have room for more text per row? Maybe you can use a 40x24 program
if you have the spare RAM for it.

I would think so few VIC users can utilize all 35K of RAM expansion
that if the driver code takes extra space, you might consider omit it.
For example, the switchable 32K expansion I own sacrifices BLK5 if I
want 3K expansion. I do own a multislot expander, so in theory I could
get an external 3K expansion (or maybe take advantage of the memory
inside my Forth cartridge?) in combination with the memory expansion
to have access to 35K.

Anyway, Groepaz could, if he owned his own machine, piggyback RAM inside
the computer (possibly with an on/off switch) to get 3K expansion and at
the same time make it incompatible (a true SuperVIC :-) with the rest of
our VICs by letting the VIC-I access this extra memory.

Anders Carlsson

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