Audiomedia 1 Nubus Mac help needed
#938556 - 04/09/11 03:52 PM
I have aquired an Audiomedia I (rev B.1) Nubus soundcard for vintage Mac. When I put it
into my Mac IIfx the computer starts up and when it comes to read the cards it halts with
"buss error" - when I remove the audiomedia card, the computer works as normal.
There seems to be something with the Audiomedia card that causes the computer to throw a
wobbly when it reads the card's identity. Does anyone know if I need to set the card's
jumpers in a particular way? There are 3 jumpers, 2 near the main CPU chip look likely.
Just for fun, if I remove the card's erprom or cpu chip the computer boots just
fine - but of course the Audiomedia is not seen.
Booting with extensions off
makes no difference. Clues anyone?
Re: Audiomedia 1 Nubus Mac help needed
#938757 - 05/09/11 02:53 PM
thanks "scope" for your thoughts - ahem.. 10GB of HD if you please, OK 1 FD fitted. it's
still fun, OS 7.5.5 too, runs Cubase 2.5 lovely.
Anyway, yes I've tried the card in
different slots, no difference but take your point about sensitivity.
At present I
only have 1 nubus Mac running, I have another IIfx in hospital but I suspect that too
might show the same error.
Which leads me to your first point about it being
a clocking issue. I have read something similar to this elsewhere, the IIfx nubus clock
runs at a different speed to the Audiomedia card but not yet figured out what to do about
I have read ppl do use this card in the IIfx so it should be possible.
There are some jumpers on the Audiomedia card that seem to connect to the CPU/DSP, a
working example would be helpful as the possible combinations of trial and error are quite
large. JP1, 2 and 4 look likely.