Free DOS Memory Block

Call With

AX = 0101H
DX = selector of block to be freed

Returns

if function successful
Carry flag = clear

if function unsuccessful
Carry flag = set
AX = error code

0007H	memory control blocks damaged (also returned by DPMI 0.9 hosts).
0009H	incorrect memory segment specified (also returned by DPMI 0.9 hosts).
8022H	invalid selector

Notes

• All descriptors allocated for the memory block are automatically freed by this function, and are no longer valid after this function returns.

• Under DPMI 1.0 hosts, any segment registers which contain a selector being freed are zeroed by this function.

• Refer to the rules for descriptor usage in Appendix D.