As I wrote in my previous mail, in tested program segment is about 200000 times called INT0x16 Fn 0x11 : Check_Enhanced_Keystroke. In corresponding dosemu routines in "base/bios/int16.c" are called some delay functions - maybe these may add some delay to program execution. On my system CLK_TCK=100 (ticks/sec), thus JIFFIE_TIME=10000 and INT2F_IDLE_USECS=80000 (=> 80msec delay). But as I wrote, on my faster PC exec time was 3 sec, thus delay added in INT16 can't be longer. Bart Oldeman probably can say more about this. -- To unsubscribe from this list: send the line "unsubscribe linux-msdos" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html