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 Interrupt table
------------------------------------------------------------------------------
 Int     Locus     Description
------------------------------------------------------------------------------
 00      CPU       Divide by zero
 01      CPU       Single step
 02      CPU       Non-maskable
 03      CPU       Breakpoint
 04      CPU       Overflow trap
 05      BIOS      Print screen
 06      CPU       Invalid opcode
 07      CPU       Coprocessor not available
 08      IRQ0      Timer
 09      IRQ1      Keyboard
 0a      IRQ2      Slave 8259 or EGA/VGA vertical retrace
 0b      IRQ3      COM2 service
 0c      IRQ4      COM1 service
 0d      IRQ5      Fixed disk or data request from LPT2
 0e      IRQ6      Floppy disk service
 0f      IRQ7      Data request from LPT1
 10      BIOS      Video
 11      BIOS      Equipment determination
 12      BIOS      Memory size
 13      BIOS      Disk I/O service
 14      BIOS      Serial communications
 15      BIOS      System services
 16      BIOS      Keyboard services
 17      BIOS      Parallel printer
 18      BIOS      ROM BASIC loader
 19      BIOS      Bootstrap loader
 1a      BIOS      Time of day
 1b      BIOS      User defined ctrl-break handler
 1c      BIOS      User defined clock tick handler
 1d      BIOS      6845 video parameter pointer
 1e      BIOS      Diskette parameter pointer
 1f      BIOS      Graphics character table
 20      DOS       General program termination
 21      DOS       Function request services
 22      DOS       Terminate address
 23      DOS       Control break termination address
 24      DOS       Critical error handler
 25      DOS       Absolute disk read
 26      DOS       Absolute disk write
 27      DOS       Terminate and stay resident
 28      DOS       Idle loop
 29      DOS       Fast TTY console I/O
 2a      DOS       Critical section and NETBIOS
 2b-2d   DOS       Internal
 2e      DOS       Exec command from base level command interpreter
 2f      DOS       Multiplexer
 30      CPM       Far jump vector
 31      DPMI      DOS Protected Mode Interface
 32                Reserved
 33                Mouse support
 34-3e             Microsoft/Borland floating point emulation
 3f                Overlay manager
 40      BIOS      Hard disk
 41      BIOS      Fixed disk 0 parameters pointer
 42      BIOS      Relocated video handler
 43      BIOS      User font table
 44      BIOS      First 128 graphics characters
 45      BIOS      Reserved
 46      BIOS      Fixed disk 1 parameters pointer
 47      BIOS      Reserved
 48      BIOS      PCjr cordless keyboard translation
 49      BIOS      PCjr non-keyboard scancode translation table
 4a      BIOS      User alarm
 4b-4f   BIOS      Reserved
 50      BIOS      Periodic alarm from timer
 51-58   BIOS      Reserved
 59      BIOS      GSS Computer Graphics Interface
 5a      BIOS      Cluster adapter BIOS entry point
 5b      BIOS      Cluster adapter boot
 5c      NETBIOS   NETBIOS interface, TOPS interface
 5d-5f   BIOS      Reserved
 60-67             User software interrupts
 67      EMS       LIM/EMS specification
 68                APPC
 69-6b             Reserved
 6c      DOS       DOS 3.2 real time clock update
 6d-6f             Reserved
 70      IRQ8      Real time clock
 71      IRQ9      Software redirected to IRQ2
 72      IRQ10     Reserved
 73      IRQ11     Reserved
 74      IRQ12     Mouse interrupt
 75      IRQ13     Numeric coprocessor NMI error
 76      IRQ14     Fixed disk controller
 77      IRQ15     Reserved
 78-79             Unused
 80-85             ROM BASIC
 86-f0   DOS       Reserved for BASIC interpreter use
 86      NETBIOS   NETBIOS relocated int 18
 e0      CPM       CP/M 86 function calls
 f1-ff             Reserved