Hi all,

I put together a TSR to emulate a MPU-401 MIDI interface card. Release with source: http://bjt42.github.io/softmpu

Things that might be interesting from a code perspective:

Calls high-level C procs from asm
I/O port trapping using EMM386
Hooking EMM386 GDT to allow PM access to far data
H/W interrupt generation using RTC
H/W interrupt generation using Sound Blaster
Delay timing using port 061h

Source has comments. Some of this stuff is not at all well documented so may come in useful for someone.

good work bjt but ur site say Microsoft C 6.0A & MASM 6.11 are required

btw welcome to fasm board bjt

Yes not FASM I am afraid. Still I think the code may come in handy for someone

When I saw this, I vaguely remembered such things would require MS EMM386 or similar.

BTW, I assume OpenWatcom + JWasm could be easily used to rebuild this, but I've not looked closely nor actually tried.

But it's still very impressive, though. Kudos.