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Dilwyn Jones wrote:
>> None of the backplanes I know, including Qplane and Mplane, have any
>> buffering.
> No, when I looked at this in more detail, I realised it was only the
> CST Q+4 which had buffering - it had a small circuit board which
> fitted in the QL expansion slot and a rather rigid ribbon cable which
> fed the connections to the Q+4 which sat under the QL.
I have never seen a Q+4 but that method would likely be very bad for noise.
>
> Did you have to make any concessions for signals at all on the Mplane,
> any capacitors or anything to control noise or signal degradation?
>
Plenty of capacitors. The inner power/ground planes probably help as
well. The power to the QL should *not* be done by shorting the 7805
regulator - the "easiest" way. That increases the 5V line length a lot.
The 9V pin(s) on the J1 expansion connector should be soldered direct
to the QL 5V rail. This is actually very close.
Aurora of course is powered direct from the backplane.
When I ran a BBS with Qplane I had a lot of Qubide problems. I had to
visit Phil Borman a couple of times to recover the HD. One session
lasted until 4am! This got so bad I installed a 23 partition win2_ for
backups. Since Mplane I have not had one hard disk problem, with the
identical setup (Aurora/Qubide/SGC).
Tony
- --
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