[Coco] Multipak redesign/replacement / New CoCo...

[S Klammer]

If cheap cables are deemed a requirement, why not use two?

Or, if over/under is not deemed viable, then with buffering handled before
the breakoff section, perhaps an "L" or "-I" shaped board?

Shain
On Feb 24, 2015 9:16 PM, "RETRO Innovations" <go4retro at go4retro.com> wrote:

> On 2/24/2015 1:35 PM, Gene Heskett wrote:
>
>>
>>
>> The 80 wire cable with 3 40 pin headers on it that I just checked,
>> appears to
>> have 34  usable connections in it, there are 6 of the pins on the side
>> with
>> the blocked pin tied together.  I wonder if there are true, 80 pin IDC
>> connectors available for that stuff.
>>
> According to the above, that's 33 lines (6 pins + key) = 7
>
> According to the link I went to, there are 7 ground lines:
> 2,19,22,24,26,30,40 (all connected to the internal 40 ground lines)
> And, then pin 34 is removed
> Pin 20 is a key
>
> So, while 34 might be available, I think 32 (or 31, if it's an ATA66 cable
> and pin 34 is removed) are all you can guarantee as available.
>
>  So the 34 I just measured isn't enough.
>>
> If you dropped SND and maybe ditched address line 14 and 15 (it appears as
> though nothing on the expansion bus is accessible below c000, so address
> line 14 and 15 are always high), and maybe removed another line (not sure
> what), you could get there.  But, that's a pretty poor design decision just
> to use a cheap cable.
>
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