[Coco] 8 slot multi pak

[Dave Philipsen]

Yes.


On 1/19/2017 8:21 AM, John W. Linville wrote:
> Did you work for Chuck-E-Cheese???
>
> On Wed, Jan 18, 2017 at 01:32:28AM -0600, Dave Philipsen wrote:
>> Yes, that's possible.  I have some old passive backplanes that were used for
>> an animatronics system that used a 6502 processor at 1 MHz as the main board
>> and the CPU card with just a single set of buffers would run 8 or 9 other
>> cards on the backplane.  The backplane fit into a 19" rack and I don't
>> believe there was any kind of termination on the end.  Literally hundreds of
>> these card cages were made and used about 12 hours a day, 365 days a year
>> and some are still running today (since 1977) and have had no problems in
>> that regard.  Some expansion cards had 6821s, some had 6850s, that sort of
>> thing.  The backplane PCB was double thickness - .125".
>>
>> Dave
>>
>>
>> On 1/18/2017 1:18 AM, RETRO Innovations wrote:
>>> On 1/18/2017 12:44 AM, Dave Philipsen wrote:
>>>> I think you could probably drive 8 slots with a single set of
>>>> buffers.  Just make sure the buffers have a high fanout.  I think
>>>> some buffers can do 20 or more TTL loads on fanout.  And you might
>>>> also want to experiment with termination on the end of the lines.
>>> I meant to also note that the capacitance might be an issue, but forgot
>>> to add that before sending.  TI and S-100 bus machine shave 8-12 slots,
>>> but most include buffers on each card to deal with the issue.
>>>
>>> Jim
>>>
>>>
>>
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