INT 67,49 - Get I/O Port Addresses (LIM EMS ≤ 3.0)
AH = 49h
ES:DI = far pointer to storage array
on return:
AL = board count (0 < AL <= 4)
AH = 00 success
= error code (see EMS STATUS)
- defined in EMS 3.0, but undocumented in EMS 3.2; new software
should not use this function, but old software still works
- registers not listed are preserved
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