Int 21/AH=99h

AH = 99h DS:BX -> memory location to block on CX = timeout in milliseconds DH = nonzero if interruptable

Return:
CF clear if awakened by event AX = 0000h CF set if unusual wakeup ZF set if timeout, clear if interrupted by signal AX = nonzero

Desc: Suspend calling process until another process sends a "restart" signal or a timeout occurs

See Also: AH=9Ah - INT 2F/AX=0802h

Category: DOS Kernel - Int 21h - E