Int 2F Fn F000 U - 4map - Installation Check [K] AX = F000h Return: AX = 00FFh Program: 4MAP is a keybinding program for 4DOS (see AX=D44Dh) by Ho-Ping Tseng Note: returns AX=00FFh for any value of AL not listed here See Also: AX=D44Dh,AX=F001h,AX=F002h