[Coco] Prototyping boards/breadboards for coco cartridge port.

[Louis Ciotti]

Looking at the COCO schematic in SAMS computer facts, and if the pin 
location information correct for CN1, the cartridge connector, on Page 
22 showing the front view?

On 3/13/2012 8:44 PM, jdaggett at gate.net wrote:
> The pitch of the pins is 100mils (0.100 inch)
>
> you should make the pads at least 0.050 inch wide (50mils) and around 0.350 inch (350mils)
> in length. I would go no wider than 0.062inch (62mils) for the surface mount pads tha make
> up the pins.
>
> If you look at the FD502 floppy controller or some of the ROM packs, you will see that there
> is a unique routed shape for the board. There are some fab houses that will charge a lot
> extra to do that kind of routing. Some of the Chinese fab houses may not. The FD502
> cartridge has about a 0.130 inch route around the section that plugs into the COCO. The
> smallest most houses will do in 0.093 inch. Some houses will charge extra for the larger or
> non standard router bits.
>
> I have the deminsions for the cartridge connector based on a floppy disk cartridge that I have
> for my Coco3. It is on ExpressPCB and I would have to dig through another hard drive to find
> the files and library.
>
> As for buffers I would recommend the TI SN74LVC8T245. This is a 8 bit buffer and level
> shifter. It is functionally identical to the 74LS245 but with level transaltion say from 5 volt to
> 3.3VDC. I would use this on the data bus.
>
> james
>
> james
>
>
>
> On 13 Mar 2012 at 8:10, Louis Ciotti wrote:
>
>> I maybe able to develop a simple proto board if someone has the correct
>> dimensions for the card edge connector, i.e. length, "pin" spacing, and
>> size.
>>
>> On Tue, Mar 13, 2012 at 12:23 AM, Andrew<keeper63 at cox.net>  wrote:
>>
>>> Steven,
>>>
>>> Try contacting this guy:
>>>
>>> http://www.plainsteve.com/**music/<http://www.plainsteve.com/music/>
>>>
>>> He's the creator of this project:
>>>
>>> http://forums.parallax.com/**showthread.php?132490-ProCoCo-**
>>> Cart-A-Propeller-based-Tandy-**Radio-Shack-Color-Computer-2-**cartridge<http://forums.parallax.com/showthread.php?132490-ProCoCo-Cart-A-Propeller-based-Tandy-Radio-Shack-Color-Computer-2-cartridge>
>>>
>>> http://propellerpowered.com/?**p=617<http://propellerpowered.com/?p=617>
>>>
>>> (unfortunately, the link in the thread no longer works, but the email
>>> address on that music page is correct, as far as I can tell).
>>>
>>> He had some small prototyping boards that he was selling at one time.
>>> Whether he still is or not, I don't know...
>>>
>>> -- Andrew L. Ayers, Glendale, Arizona
>>>
>>>
>>> --
>>> Coco mailing list
>>> Coco at maltedmedia.com
>>> http://five.pairlist.net/**mailman/listinfo/coco<http://five.pairlist.net/mailman/listinfo/coco>
>>>
>> --
>> Coco mailing list
>> Coco at maltedmedia.com
>> http://five.pairlist.net/mailman/listinfo/coco
>>
>>
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>