First post, by badmojo
I picked up this ISA card off the local 'bays for a buck, because I thought the combination of a real OPL3, volume knob, creative CT2501 chipset, and wave table header looked interesting.
Does anyone know anything about these things?
It's a Vibra chipset, so I chucked it into a Pentium based machine which had a Vibra16S card in it. The 16S isn't quite plug and play, but rather uses the SET BLASTER line and a call to DIAGNOSE to initialize itself. This Acer however doesn't need the call to DIAGNOSE, just SET BLASTER. I don't get that - how would I go about changing the IRQ, etc? There's a bank of jumpers on the left under JB01, but the labels (from top to bottom) are:
Nothing there regarding IRQ or DMA.
The card sounds pretty good but bizarrely, the left and right signals are reversed. What's with that? If I choose Sound Blaster Pro in Duke3d, the signals are correct, but the SB16 option switches them. They're reversed in DOOM too.
And finally the Wavetable header does work at address 330, but it has the hanging note bug, which is a shame.
All told it's a strange card and I can't seem to find any information on it, so I'm hoping someone here will know how it came to be.