DOS ain't dead

Small bug in XCDROM32 that may also be found in UIDE/UDVD2 (Developers)

posted by Japheth , Germany (South), 22.05.2026, 08:02

Hello,

recently a small bug was fixed in xcdrom32 that affected game "Tempest 2000":

https://github.com/Baron-von-Riedesel/Jemm/issues/44

The fix is rather trivial:


ReqMCS:
    call DoIOCmd        ;Issue "Test Unit Ready" command.
    mov edi,[AudAP]     ;Get media-change flag from table.
    mov al,[edi-1]
    mov [esi+1],al      ;Return media-change flag to user.
;--- v1.6: set audio status busy flag
;    ret
    jmp ReadAudioSt


Since xcdrom32 is based on one of J.R. Ellis' drivers (~ 20 years ago), those drivers may also benefit from a fix.

---
MS-DOS forever!

Complete thread:

• Small bug in XCDROM32 that may also be found in UIDE/UDVD2 - Japheth, 22.05.2026, 08:02 (Developers)
  • Small bug in XCDROM32 that may also be found in UIDE/UDVD2 - mceric, 22.05.2026, 09:30