INT 15,80 - Device Open
AH = 80h
BX = device id
CX = process id
on return:
CF = 0 if successful
= 1 if error
AH = 80h for PC & PCjr
= 86h for XT (BIOS after 11/8/82)
- available on the AT, XT 286, PS/2 and XT with BIOS after 11/8/82
- designed for use in simple multitasking
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