Re: VIC-20 "all games in one" cartridge update

From: john/lori (
Date: 2001-04-20 19:11:29

> Yes.  The 32k RAM can be mapped to all memory blocks ($0400-$0fff,
> $2000-$7fff and $a000-$bfff).  There are no mechanic switches, but if you
> hold down stop, 3 or 8 during reset (or press one of these keys in the
> menu program), the computer will enter BASIC with 0, 3 or 24 kilobytes of
> expansion memory.

32K isn't enough to fill the memory space, so I assume you can't map
all empty spots at once, ie the map must be change able?

Will this allow the cartridge to be used where an internal expansion has
been performed?

Where does the PROM appear and how does it get mapped (I believe you
said the
unpacker needs RAM at A000-BFFF)?

If there are games that check to see if they're runninng out of ROM or
perhaps it would be useful to make (part of) the mappped RAM read only
(under program control)

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