Re: VIC-20 Cartridge combinations

From: Marko Mäkelä <>
Date: Tue, 18 Jul 2017 11:04:02 +0300
Message-ID: <20170718080402.tc6pf7jas2lt4dwr@hp>
On Tue, Jul 18, 2017 at 09:37:21AM +0200, Mia Magnusson wrote:
>But for all other kinds of cartridges there are multiple possible 
>configurations. The most obvious is to have switchable ram at all 
>possible places (including the two I/O blocks) in the memory map.
>I'm thinking about a design whith four software writable registers for 
>freely selecting rom images for 6000, 7000, A000, B000 and some 
>hardware to reuse one of the registers for 2000 (for games) and perhaps 
>also reuse one of the registers for 4000 (for a relocated monitor).

This sounds much like the UltiMem by Jim Brain. I wrote the VICE 
emulation for it and ported the menu firmware of my Vic Flash Plugin to 

I also wrote an image composer program. Unlike the Vic Flash Plugin, the 
ROM images are directly stored in the Flash ROM and only bank-switched. 
In the Vic Flash Plugin, memory was saved by decompressing the images 
from flash to RAM with PuCrunch. With 8 megabytes of flash (instead of 
the 4 megabytes in the Vic Flash Plugin), this is no longer necessary, 
because there only is about 5 megabytes of Vic-20 software out there.


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Received on 2017-07-18 09:00:07

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