[Coco] coco cartriges

[RETRO Innovations]

On 10/21/2014 4:08 PM, Arthur Flexser wrote:

The two types of adapters are equivalent.  The 2364 Adapter will support 
larger EPROMs, if folks need that, but I doubt anyone does.

I think the prices are probably the only difference of note.

Disclosure, in case anyone does not already know, go4reto.com is my site.

Jim

> 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
>>>
>> --
>> Coco mailing list
>> Coco at maltedmedia.com
>> https://pairlist5.pair.net/mailman/listinfo/coco
>>
>>
>> --
>> Coco mailing list
>> Coco at maltedmedia.com
>> https://pairlist5.pair.net/mailman/listinfo/coco
>>


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