Re: final cartridge for vic 20

I was thinking to something simple, a small flash / eprom with a menu to 
load a cartridge image to a ram
mapped at the cartridge location and write protected

the vic20 is quite far for me :) I've not really use one since 1985...
(except to repair and play a little bit with the board I just repaired

so I'll have to check that I'm not totally wrong :) about this machine

--
didier

On 11/07/2015 08:56, Marko Mäkelä wrote:
> On Sat, Jul 11, 2015 at 08:02:01AM +0200, didier derny wrote:
>> I'll probably end with a small board plugged on the 6502 socket with 
>> 6502 + gal + ram to implement only the ram and let the cartridge 
>> connector free
>
> The 6502 socket sounds like a reasonable approach. Maybe add a small 
> 5-volt Flash ROM for some auto-start firmware, to save typing when 
> loading software. The software would be loaded from some external 
> source, such as the SD2IEC. Basically, a simple loader would load an 
> image file to the appropriate RAM banks. Compression is not really 
> needed.
>
> Some years ago, I finished the Vic Flash Plugin that was under 
> development for the best part of this millennium: 
> http://www.iki.fi/~msmakela/8bit/vfp/
>
> The Vic Flash Plugin cartridge uses the 5-volt Flash chip Am29F032B 
> which probably is big enough (4MiB) to host all Vic-20 software ever 
> written. It was difficult to obtain even back then. The hardware was 
> never sold.
>
>     Marko
>
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