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Copyright 1991 David Jurgens |
INT 15,20 - PRINT.COM Critical Region Flag (undocumented DOS 3.x+)
AH = 20h
AL = 00 disable user critical region flag
= 01 enable user critical region flag
ES:BX = pointer to user critical region flag byte (AH = 1)
returns nothing
- provides PRINT.COM with the address of a byte to increment on
entry to DOS functions
- see bibliography reference for "Undocumented DOS"
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| Esc or Alt-X to exit |
int 15,20 |
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