Thank you very much for your wonderful schematics... but I think I goofed
somewhere in the base unit. I can't read or write carts. I tried writing a few
games to the RAM cart, and it just said that all the bytes were bad. I also
tried reading PacMan and Combat, and neither worked in an emulator. It also
thinks that there is a 2k cart in the thing all the time, even when there isn't
a cart in it. Did I wire a connector backward? Any ideas? Thanks!
Ian Primus
ian.primus@xxxxxxx
Maximiliam Luppe wrote:
> Hi, every body. I finished the 4KCart schematic for any 8k*8 SRAM (with 28
> pins). It can be found at:
>
> ftp://kew.sel.eesc.sc.usp.br/Electric/Atari2600/SRAM-Cart/4KCart.zip
>
> A modified version for 32k*8 SRAM (28 pins) can be found at:
>
> ftp://kew.sel.eesc.sc.usp.br/Electric/Atari2600/SRAM-Cart/4KCart-32Kx8.zip
>
> It's possible to store eight 4k games in the 32k*8 SRAM. Just add 2 new
> switch to the lines A13 and A14 of the SRAM (just like line A12). You can
> use the two inverters of the 74HC14 that are unused. Good Luck.
>
> Max
>
> -----Mensagem Original-----
> De: "Gonzalo" <horcas@xxxxxxxxxxxxxxxxxx>
> Para: <stella@xxxxxxxxxxx>
> Enviada em: Quinta-feira, 26 de Abril de 2001 03:17
> Assunto: RE: [stella] SRAM cart for 2600?
>
> > > Once I get it
> > > working, I will be creating a web site documenting the process, and I
> will
> > clean
> > > up these schematics a little, etc. Thanks!
> >
> > I'll be waiting for it! I'm trying to build the SRAM cart too, I have the
> 6
> > chips (SRAM HM6264LP-70 8K*8 included)... and spent $8.91 for it (dollars)
> > so I really hope it works...
> > The SRAM cost $3.9095, it's not too much. My idea was to get a
> supercharger
> > but it will cost $100 exactly to me (shipping and stuffs), so the SRAM
> cart
> > will be a good deal if it works.
> > Next step is to make the PCBs (hard to design) and I have the same
> questions
> > you have about unlabeled parts.
> >
> > Good Luck for you!
> >
> >
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> >
>
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