[Coco] coco cartriges

[Mark Marlette]

Jim,

One of the biggest differences between them is the actual thickness of the final assembly with an EPROM loaded.

Cloud-9's will fit in the existing dip and allow the case cover to close. I have yet to find a controller that the device doesn't fit in to and lid cover not close.


That was a requirement of the design. That required that individual pin sockets to be used and placed, thus driving up the assembly cost.

Currently sold out, last one went out this AM and are a PIA to build.... :)


Regards,

Mark Marlette
http://www.cloud9tech.com
mark at cloud9tech.com



________________________________
 From: RETRO Innovations <go4retro at go4retro.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com> 
Sent: Tuesday, October 21, 2014 7:27 PM
Subject: Re: [Coco] coco cartriges
 

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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