AX = 1218h Return:DS:SI -> saved caller's AX,BX,CX,DX,SI,DI,BP,DS,ES (on stack)
Return:DS:SI -> saved caller's AX,BX,CX,DX,SI,DI,BP,DS,ES (on stack)
Note: Only valid while within DOS
Category: DOS Kernel - Int 2Fh - D
