Interrupt 08h Timer(0:0020h) 55ms timer "tick" taken 18.2 times per second. Updates BIOS clock and
(IRQ0) turns off diskette drive motors after 2 seconds of inactivity.
entry AH 08h
return absolute addresses:
40:6C number of interrupts since power on (4 bytes)
40:70 number of days since power on (1 byte)
40:67 day counter on all products after AT
40:40 motor control count - gets decremented and shuts off diskette
motor if zero
note Int\1C invoked by int 08h as a user interrupt.
(internal) - DOUBLE FAULT (80286/80386 protected mode)
Called when multiple exceptions occur on one instruction, or an
exception occurs in an exception handler. If an exception occurs in the
double fault handler, the CPU goes into SHUTDOWN mode (which circuitry
in the PC/AT converts to a reset).
file: /Techref/INT/08.htm, 0KB, , updated: 1999/4/22 09:13, local time: 2024/9/1 04:22,
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