Looking at the location of J3, I'm guessing it's PC Speaker Out. The two wavetable headers (or something that looks a lot like it) are very unusual, I'm willing to wager that J1 is related to the function of the second header.

As for confirmation that it's an OPTi 928 / MAD16... try and run the initializer software for MAD16 and see if it registers.

dionb wrote on 2024-04-23, 12:27:

As for confirmation that it's an OPTi 928 / MAD16... try and run the initializer software for MAD16 and see if it registers.

Thanks! I'll try to see it this weekend.

dionb wrote on 2024-04-23, 12:27:

The two wavetable headers (or something that looks a lot like it) are very unusual, I'm willing to wager that J1 is related to the function of the second header.

I'm pretty sure this is not a secondary wave table header because the grounds are not where they should be. And I think if it was a secondary wave table header they should be serialized with pin 1 connected to pin 1 and so on. That's not the case. So I think it is some sort of I/O connector digital or analog with not all pins connected to something. And indeed J1 can be a pass through of some sort to "configure" J2 but how? Big, flappy, messy mystery...

dionb wrote on 2024-04-23, 12:27:

Looking at the location of J3, I'm guessing it's PC Speaker Out.

That's interesting! I've never seen something like this. Speaker In is common, but Speaker Out for internal speaker, despite being a good idea seems uncommon. If correct, that would be the first sound card I have to do that 😁

I think I have a slightly older version of that card:

It says "MediaMagic ISP-16" on the PCB and indeed has a MAD16 (manufactured by Mediachips???). It also seems to have jumpers for configuration so I'm not sure that it actually the same card as yours.
I kept the contents of the driver disk.

Datadrainer wrote on 2024-04-23, 14:02:

Thanks! I'll try to see it this weekend. […]
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dionb wrote on 2024-04-23, 12:27:

As for confirmation that it's an OPTi 928 / MAD16... try and run the initializer software for MAD16 and see if it registers.

Thanks! I'll try to see it this weekend.

dionb wrote on 2024-04-23, 12:27:

The two wavetable headers (or something that looks a lot like it) are very unusual, I'm willing to wager that J1 is related to the function of the second header.

I'm pretty sure this is not a secondary wave table header because the grounds are not where they should be. And I think if it was a secondary wave table header they should be serialized with pin 1 connected to pin 1 and so on. That's not the case. So I think it is some sort of I/O connector digital or analog with not all pins connected to something. And indeed J1 can be a pass through of some sort to "configure" J2 but how? Big, flappy, messy mystery...

dionb wrote on 2024-04-23, 12:27:

Looking at the location of J3, I'm guessing it's PC Speaker Out.

That's interesting! I've never seen something like this. Speaker In is common, but Speaker Out for internal speaker, despite being a good idea seems uncommon. If correct, that would be the first sound card I have to do that 😁

The "Media Magic" brand seems to have been associated with IPC Technologies Inc (source: PC Mag)...

"(Austin Computer Systems, Austin, TX) A PC manufacturer founded in 1985 by Robert Diwan that sold a full line of PCs via direct marketing and through the dealer channel. In 1993, it was acquired by IPC (Integrated Processors & Communications), a Singapore PC manufacturer founded in 1985 by Patrick and Benjamin Ngiam. In 1997, it went out of business. "

See Driver for MediaMagic Telemetry-32 OPTi 82C950

pyrogx wrote on 2024-04-23, 18:02:

I kept the contents of the driver disk.

Thanks! During my search I found this card, but having clear nice picture confirm they seems very similar indeed. My opinion is mine has to be a OEM variant of the ISP-16. But for what brand?

@pyrogx, thank you for the original Win3x/DOS driver. I'll try that this we and report my discovery.
@PC Hoarder Patrol, thank you for the info. I don't think the Telemetry driver can apply as it is an OPTi based card but anyway thank you for the link to that interesting topic as it has many useful knowledge.