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DOS32AWE - RAM wavetable MIDI possible for PM games under DOS (Announce)

posted by Japheth Homepage, Germany (South), 20.01.2026, 08:03

> Do you have some AWE32/64 for testing?
Yes, I digged out a P3 MB with ISA slot and an AWE32.

> AFAIK it works a way called HW-assisted port forwarding/emu. aweutil sets
> the HW to generate NMI on ISA bus when port access occur (some HW IO
> address comparator) so it comes after, not before. As NMI was intended to
> have the highest priority so it can occur any time any ring...
I assumed it happens just after the port access only ( or may be 2-3 instructions later ), but this simply isn't the case.

> why is it problem in HDPMI? Something with reentrancy?
Yes - some parts aren't reentrant: of course the mode switches must not be interrupted, but there are more places. But should be no problem to make a special variant that masks NMI while ring0 code is running.

I guess the same is true for Jemm...

---
MS-DOS forever!

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