[Coco] coco cartriges

[Arthur Flexser]

Or you could check into the adapter specifically for the CoCo that Cloud-9
sells.
http://www.cloud9tech.com/

Art

On Tue, Oct 21, 2014 at 5:02 PM, didier derny <didier at aida.org> wrote:

> Ok, thanks
>
> I'll check if one of these adapters:
>
> http://store.go4retro.com/2364-adapter/
> http://store.go4retro.com/23xx-adapter/
> http://store.go4retro.com/categories/Commodore/Hardware/ROM%252del/
>
> is compatible...
>
> --
> Didier
>
>
>
> -----Message d'origine-----
> De : Coco [mailto:coco-bounces at maltedmedia.com] De la part de Arthur
> Flexser
> Envoyé : mardi 21 octobre 2014 22:50
> À : CoCoList for Color Computer Enthusiasts
> Objet : Re: [Coco] coco cartriges
>
> One way to find out if it is 4K or 8K would be to plug the cartridge in
> after taping over the pins that cause the autostart, and check the contents
> of memory at $C000 and $D000.  If the code at $D000 is a duplicate (ghost)
> of that at $C000, then it's a 4K Rompack.  Which doesn't necessarily mean
> it
> would be incompatible with an 8K EPROM, or difficult to make it compatible
> by connecting the unused (possibly grounded or tied high) address line to
> the relevant pin on the cartridge connector.  (On a CoCo 3, you'd first
> need
> to do a POKE&HFFDE,0 to put it in ROM mode in order to see the cartridge
> contents.)
>
> A 24-pin EPROM that is compatible with that used in the CoCo's disk
> controller is very difficult to find.  The 68764 and 68766 fill the bill,
> but are almost unobtainable nowadays, though an adapter or hand-rewiring
> can
> allow use of a compatible 28-pin EPROM like the 2764, which is much easier
> to obtain.  You might be better off hunting for a cartridge that already
> has
> a 28-pin ROM.
>
> Art
>
> On Tue, Oct 21, 2014 at 4:08 PM, didier derny <didier at aida.org> wrote:
>
> > I got a  coco2 cartrige on ebay.
> >
> >
> >
> > I opened it, without breaking it J
> >
> > I found inside  a small board that can contains  2 x 24 pins roms
> >
> >
> >
> > On my cartridge, there is only one rom installed..
> >
> >
> >
> > Are these roms 4k or 8k ?  any eprom compatible with these eprom  ?
> >
> >
> >
> > Marking on the eprom:
> >
> >
> >
> > SCM90706P
> >
> > TANDY  C 1981
> >
> > 8070033
> >
> > M 8140
> >
> >
> >
> > Any way to use this cartridge to install a rom to start drivewire ?
> >
> >
> >
> >
> >
> > Thanks
> >
> >
> >
> > --
> >
> > Didier
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > https://pairlist5.pair.net/mailman/listinfo/coco
> >
>
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