From: Marko Mäkelä (msmakela_at_gmail.com)
Date: 2007-08-29 15:02:14
On Wed, Aug 29, 2007 at 02:23:51PM +0200, Anders Carlsson wrote:
> Marko Mäkelä wrote:
>
>> the VIC-20 all-in-one cartridge (32k RAM and 4MB Flash ROM).
>
> As you may or may not know, parallel efforts in building a VIC-20 multicart
> are currently in process. The first batch of working carts, filled with
> software will very soon be available to the public.
I didn't, but this is good news for me: one fewer project to worry
about.
> See the Denial web forum for more details.
Can you post a link, or a summary of the hardware? If you are referring
to the "FORUM" link at http://sleepingelephant.com/denial/, it seems
to require registration.
The cartridge I built a few years ago contains 32k of SRAM (HM62256), a
4 MiB 5-volt Flash ROM from AMD if I remember correctly, and a Lattice CPLD
that implements memory banking. I wrote a menu program for launching
programs or cartridges, which are stored in the flash in PuCrunch
format. The menu program auto-detects PAL/NTSC, needed for setting the
screen height and a color bar that acts as the selection cursor. I'm
happy to contribute to the project if it is considered to be useful.
If I did the same thing today, I'd probably use a small flash ROM chip
for the menu system and include a CF or MMC slot for loading the content.
That'd make data transfers much easier.
Marko
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