OPTiFM(tm) native, OPL3 superset mode \ VOGONS

OPTiFM(tm) native, OPL3 superset mode

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First post, by pachuco

Posted on 2024-06-02, 19:22

pachuco Offline

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https://dosdays.co.uk/media/opti/82C925.pdf
https://dosdays.co.uk/media/opti/OPTI82C931.pdf

The specs claim that OPTiFM(tm) native mode is capable of 22voice, 52op, with a "unique modulation tehnique" and "flexible way to assign operators and voices".

Is there any piece of software that uses this native mode?

For example, ESSFM was supported in the form of proprietary midi drivers for windows, and Miles Sound System(in DOS).

Edit:
So, OPTi never made their own drivers, and instead, sold their chips to third parties for soundcard and driver design.
http://www.opti-inc.com/my_html/part_mm.html

Reply 1 of 2, by bakemono

Posted on 2024-06-03, 23:04

bakemono Offline

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Interesting. I have a '931 card but had no luck trying to read MCIR registers, let alone switch on the 'enhanced' mode to try guessing at new registers. The SNDINIT.EXE program monkeys with port $F8D a lot, but I haven't seen where any of the Windows drivers do.

GBAJAM 2024 submission on itch: https://90soft90.itch.io/wreckage

Reply 2 of 2, by pachuco

Posted on 2024-06-05, 05:27

pachuco Offline

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I suspect that the native mode docu was available as confidential/nda for the various soundcard manufacturers, and most chose not to implement it.

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