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Int 7F Fn 10 - Alloy Ntnx, Mw386 - Channel Control - Open Channel [N]
AH = 10h
CL = 00h
AL = channel number
DX:DI -> channel buffer
Return: AL = status (00h-03h,0Dh) (see below)
Note: may not be invoked from within a hardware interrupt handler
See Also: AH=10h/CL=01h,AH=10h/CL=04h,AH=14h/CL=02h
Values for status:
00h successful
01h busy
02h channel range error (not 00h-3Fh)
03h invalid subfunction
0Ah channel not open
0Ch channel already locked
0Dh unable to open
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