A-10 Tank Killer (pre-v1.5, DOS) modded executables using other IRQs rather than IRQ 2 for Roland MIDI
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I found two versions from the internet and included the original executable (PS.EXE) 
in each compressed file for the reference.
Extract and rename PS_IRQ#.EXE and overwrite PS.EXE in the game directory.
I do not know the correct reason, for this game, it seems that IRQ number 5 cannot be used for MIDI playback.
I tested IRQ 6 and 7 and confirmed they work.

patch made by: kykypyza
https://kykypyza.tistory.com/13?category=942715
https://www.vogons.org/viewtopic.php?p=952818#p952818