Re: FLASH ROM on VIC-20?

From: Nicolas Welte <>
Date: Sun, 18 Nov 2012 10:43:49 +0100
Message-ID: <>
Hi Jim,

On 18.11.2012 06:14, Jim Brain wrote:
> If someone has a link or information on a design, I'd be most appreciative.

I once added internal Flash ROM into the VIC-20 with my universal 6502 
RAM/ROM expansion. It's pretty straight forward and you can have a look at 
the logic equations of the GAL it uses ( But the equations 
for the Finaly Expansion CPLD will be more suitable for what you want to do.

Some thoughts should be spent on proper timing on the Flashs /CE /OE and 
/WE lines, this could be a little bit tricky. Because of the extra /OE line 
it is different to normal SRAM.

A simple method to connect two write-only banking registers in TTL to the 
C64 (should work on VIC-20 the same) can be seen in my NeoRAM cartridge.

An implementation to write Flash on a cartridge with TTL only would be the 
Easyflash 1 cartridge on the C64. more on


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Received on 2012-11-18 10:00:05

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