Re: VIC-20 Cartridge combinations

On 7/18/2017 2:37 AM, Mia Magnusson wrote:
> Hi
>
> I'm thinking about making a home made multi cartridge for VIC 20. (Yes,
> I know that there are quite a few already but making the hardware is a
> hobby for me).
As Marko Makela notes, Ultimem sounds a lot like your idea.  The project 
is open source (I should ensure all the files are online), so you are 
free to use it to create your design, or you can grab one, and rewrite 
the HDL to suit your needs.  It uses a xc95144xl, 1MiB SRAM, and 8MiB 
FLASH ROM.

> I'm thinking about a design whith four software writable registers for
> freely selecting rom images for 6000, 7000, A000, B000 and some
I chose 8kB boundaries, and used a single register for RAM1/2/3 and IO2/IO3
> Or should I go all the way with registers for each 4k block
> 2/3/4/5/6/7/A/B000 and for each 1k I/O block?
I found that creating that much granularity for the 1kB chunks was of 
little use.
>
> Combined with on/off for ROM and RAM for each 4k block would probably
> make it possible to have any desireable configuration.
I have the following options:

OFF
RAM R/W
ROM R/W
RAM R/O
> Or am I just feature creeping it so it might never be buildt?
Well, I can attest at least one person built a similar unit.

Jim


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