HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

                        INT 15 - System BIOS Services

                For more information see the following topics:

        INT 15,0  Turn cassette motor on (PC,PCjr only)
        INT 15,1  Turn cassette motor off (PC,PCjr only)
        INT 15,2  Read blocks from cassette (PC,PCjr only)
        INT 15,3  Write blocks to cassette (PC,PCjr only)
        INT 15,F  PS/2 format periodic interrupt (PS/2 only)
       INT 15,20  PRINT.COM Critical region flag (undocumented DOS 3.x+)
       INT 15,21  PS/2 power on self test (PS/2 except 30)
       INT 15,40  Read / modify profiles (convertible only)
       INT 15,41  Wait on external event (convertible only)
       INT 15,42  Request system power off (convertible only)
       INT 15,43  Read system status (convertible only)
       INT 15,44  (De)activate internal modem power (convertible)
       INT 15,4F  Keyboard intercept  (BIOS date specific)
       INT 15,80  Device open
       INT 15,81  Device close
       INT 15,82  Program termination
       INT 15,83  Event wait
       INT 15,84  Joy-Stick support
       INT 15,85  System request key pressed
       INT 15,86  Elapsed time wait (AT and after)
       INT 15,87  Move block to/from extended memory
       INT 15,88  Extended memory size determination
       INT 15,89  Switch processor to protected mode
       INT 15,90  Device busy
       INT 15,91  Interrupt complete
       INT 15,C0  Return system configuration parameters (PS/2 only)
       INT 15,C1  Return extended BIOS data address (PS/2 only)
       INT 15,C2  Pointing device BIOS interface (PS/2 only)
       INT 15,C3  Enable/Disable watchdog timer
       INT 15,C4  Programmable option select

       - CF is set and AX is left unchanged if a function requested in AH
         isn't supported
       - some Tandy BIOS's fail to restore interrupts on return from INT 15

Esc or Alt-X to exit int 15 Home/PgUp/PgDn/End ←↑↓→
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