Set Debug Watchpoint

Call With

AX = 0B00H
BX:CX = linear address of watchpoint
DL = size of watchpoint (1, 2, or 4 bytes)
DH = type of watchpoint

Value	Breakpoint Type
0	execute
1	write
2	read/write

if function unsuccessful
Carry flag = set
AX = error code

8016H	too many breakpoints
8021H	invalid value (in DL or DH)
8025H	invalid linear address (linear address not mapped or alignment error)

Notes

• Under DPMI 1.0, the handle will be in the range 0-14. Under DPMI 0.9, the handle range is not limited.

• The watchpoint handle corresponds to the bit number in the Virtual DR6 returned in the exception frame (see Int 31H Function 0212H and page 18 of the DPMI spec).