This is the contents that is printed out by my program LISTIVT.EXE.
Excluding the Segment:Offset addresses.
Jim Webster   EMail: jwebste3@bellsouth.net

INT  Description
---  ----------------------------------------------------------------------
00h  Internal. Divide by zero trap. The default handler aborts the program
               in session, generates a Divide Overflow message, and may
               leave the computer in an unstable state. Most math inten-
               sive programs will hook a safer handler to this interrupt.
01h  External. Single step "trace" interrupt. Used by DEBUG and similar
               programs. The Trap Flag must be manually set in order to
               use this interrupt (and with each call).
02h  Internal only! This interrupt is triggered by the NMI (Non-Maskable
               Interrupt) pin and causes a system crash. Cause: a parity
               error occured during a memory read, implying that one or
               more memory chips have failed. A low-level handler can be
               hooked to this interrupt in order to provide a more graceful
               system shutdown.
03h  External. Breakpoint interrupt. Used by DEBUG and similar programs to
               stop execution of a program at a specified point. (Opcode CCh).
04h  Internal and External. Math overflow. Used in conjunction with the INTO
               instruction. NOTE: If used in conjunction with the INTO
               instruction, a program specific routine must first be hooked
               into this interrupt vector to handle a math overflow.
               Its default routine is a single IRET instruction.
05h  Internal. Print screen interrupt. Invoked by Shift-PrtSc.
06h  Internal. Undefinable op-code exception. Generated by an instruction
               that does not invoke a logic routine in the CPU.
               Examples: (1) Protected Mode instructions are considered in-
               valid in Real Mode. (2) A BOUND, LDS, LES, or LIDT instruction
               specifies a register instead of a memory address.
07h  Internal. ESC op-code exception. Generated by an instruction for the
               math coprocessor if one is not present.
08h  Internal. (IRQ 0) System timer interrupt. This IRQ has the highest
               priority. INT 1Ch is also invoked by this interrupt,
               which by default is no more than an IRET instruction.
               80286+ PM = Double Exception detected.
09h  Internal. (IRQ 1) Keyboard hardware interrupt. Generated each time a
               key is pressed or released.
               80286 and 80386 = Processor Extension Protection Error.
0Ah  Internal. (IRQ 2) Spare hardware request [on the XT] and gateway to
               IRQ 8 through IRQ F [on the AT and later].
               80286+ PM = Invalid Task State Segment.
0Bh  Internal. (IRQ 3) Provides service for COM 1 & 3 [on the XT] and
               COM 2 & 4 [on the AT].
               80286+ PM = Segment Not Present.
0Ch  Internal. (IRQ 4) Provides service for COM 2 & 4 [on the XT] and
               COM 1 & 3 [on the AT].
               80286+ PM = Stack Fault.
0Dh  Internal. (IRQ 5) Provides service for hard drive controller
               [on the XT] and for LPT2 [on the AT].
               80286+ PM = General Protection Fault.
0Eh  Internal. (IRQ 6) Provides service for floppy disk controller.
               80386+ PM = Page Fault.
0Fh  Internal. (IRQ 7) Provides service for LPT1 [now obsolete].
10h  Internal and External. Provides unlimited amount of services for
               for Video and Screen output.
               80286+ PM = Coprocessor Error.
11h  External. Get Equipment List. Returns a coded value in the AX
               register giving the number of COM ports, floppy drives, etc.
               Note: This word value is from 40:0010 of the BIOS Data Area.
               80486+ PM = Misaligned Word or Doubleword Fault.
12h  External. Read Memory Size. Returns the size of conventional memory,
               in 1K blocks, in the AX register. Up to 640K.
               Pentium = Machine Check Exception.
13h  Internal and External. Provides numerous disk I/O services for reading
               from and writing to a disk, as well as formatting.
               Plus communication with an ESDI and SCSI BIOS/Controller.
14h  Internal and External. Provides numerous COM port I/O services. Such as
               for a serial printer or a modem.
15h  Internal and External. Cassette recorder I/O services [on the original
               PC and the PC JR.], device, joystick, and Extended Memory
               services [on the AT and later], and In-Port Mouse services
               [on the PS/2].
16h  Internal and External. Keyboard I/O services. Though no where as
               extensive as the services provided by INT 21h, these services
               can handle the special keys on the keyboard. Such as:
               Up Arrow, F1, PgDn, etc. This also includes the additional
               keys added by the Enhanced 101-Key Keyboard.
17h  Internal and External. Provides various printer I/O services for LPT1
               through LPT3.
18h  Internal. IBM (ROM) Tiny Basic loader.
19h  Internal and External. Bootstrap loader. Performs a warm boot.
               Is also invoked by pressing Ctrl-Alt-Del on the keyboard.
1Ah  External. System time clock services [All] and real time clock services
               [on the AT and later]. Also: PCMCIA Socket/Card services,
               Microsoft Real-Time Compression Interface, PCI BIOS services,
               and Intel PnP Auto-Configure services.
1Bh  Internal. Control Break routine. Invoked by INT 09h.
1Ch  Internal. Timer tick. Invoked by INT 08h. This occurs 18.2 times per
               second. Is common for TSR's to hook themselves into this
               interrupt vector. Its default routine is a single IRET.
1Dh  Internal only! Pointer to data (not code) that contains initialization
               values for the 6845 video controller.
1Eh  Internal only! Pointer to data (not code) that contains initialization
               values for the disk controller.
1Fh  Internal only! Pointer to data (not code) that contains the values that
               define the shapes of ASCII characters 128d-255d.
20h  External. Program terminate interrupt. Considered obsolete, but common
               in .COM programs. Notably DEBUG script files.
               MS Windows VxD services.
21h  Internal and External. Contains nearly 100 functions that cover most
               services available to the operating system.
22h  Internal. Terminate program and return to DOS routine.
23h  Internal. Control-C exit routine.
24h  Internal. Critical error handler routine. Invoked upon detection of
               an unrecoverable I/O error. If this occurs from the DOS
               prompt, you'd see the "Abort, Retry, Ignore?" message.
               (Or: "Abort, Retry, Fail?".)
25h  External. Absolute disk read function.  (FAT12 and FAT16 only.)
26h  External. Absolute disk write function. (FAT12 and FAT16 only.)
27h  External. Terminate and stay resident function.
28h  Internal. Keyboard busy/DOS idle interrupt. Invoked by INT 21h
               (AH = 01h) while DOS is waiting for a keypress. Is also
               common for TSR's to hook into this interrupt vector.
29h  Internal. Fast console output. Used by all INT 21h functions that
               write to the console. AL = the character to write.
2Ah  Internal. Provides numerous services for the MS-NET interface.
2Bh  Internal. Unused.
2Ch  Internal. Unused.
2Dh  Internal. Unused.
2Eh  Internal and External. "Undocumented". ES:SI contains the address of
               the command for COMMAND.COM to execute.
               In the form of --> length (byte value, equals length of
               "string" + 2), "string" (i.e. "DIR"), 0Dh <--.
               CS:IP are the only registers NOT destroyed by this interrupt!
2Fh  Internal and External. DOS Multiplexer interface. Provides a means of
               communication between the DOS kernal and the numerous memory
               resident programs supplied by DOS (ANSI, ASSIGN, DPMS,
               DBLSPACE, EMM386, GRAFTABL, HIMEM, KEYB, MRCI, MSCDEX,
               PRINT, MS Windows (3.x and 95), XMS, etc.).
               Also used by: Borland C++,  DPMILOAD, DESQview, Intel PnP,
               LapLink, Novell, OS/2, PharLap DOS Extender, PC Tools,
               Quarterdeck, and others.
30h  Internal. Obsolete CP/M "far jump" instruction.
     External. MS Windows PM Callback, QRIP/TSR graphics library.
31h  Internal. Obsolete CP/M "far jump" instruction.
     External. DPMI v0.9+ interface (i.e. MS Windows).
32h  Internal. Unused.
33h  Internal. Unused.
     External. Common interrupt vector taken by mouse drivers.
34h  Internal. Unused.
     External. Used for floating-point emulations in Microsoft C and Turbo C.
               (Opcode D8h.)
35h  Internal. Unused.
     External. Used for floating-point emulations in Microsoft C and Turbo C.
               (Opcode D9h.)
36h  Internal. Unused.
     External. Used for floating-point emulations in Microsoft C and Turbo C.
               (Opcode DAh.)
37h  Internal. Unused.
     External. Used for floating-point emulations in Microsoft C and Turbo C.
               (Opcode DBh.)
38h  Internal. Unused.
     External. Used for floating-point emulations in Microsoft C and Turbo C.
               (Opcode DCh.)
39h  Internal. Unused.
     External. Used for floating-point emulations in Microsoft C and Turbo C.
               (Opcode DDh.)
3Ah  Internal. Unused.
     External. Used for floating-point emulations in Microsoft C and Turbo C.
               (Opcode DEh.)
3Bh  Internal. Unused.
     External. Used for floating-point emulations in Microsoft C and Turbo C.
               (Opcode DFh.)
3Ch  Internal. Unused.
     External. Used for floating-point emulations in Microsoft C and Turbo C.
               (Segment Override.)
3Dh  Internal. Unused.
     External. Used for floating-point emulations in Microsoft C and Turbo C.
               (Stand Alone FWAIT.)
3Eh  Internal. Unused.
     External. Used for floating-point emulations in Microsoft C and Turbo C.
               ("Shortcut" Call.)
3Fh  Internal. Unused.
     External. Microsoft LINK.EXE overlay manager and DLL manager.
40h  Internal only! Floppy disk handler data (original INT 13h).
               Relocated by hard disk.
41h  Internal. Hard Disk 0 Drive Parameter Table address. Not code!
     External. CPU-MS Windows debugging kernal.
42h  Internal. Video handler for EGA, VGA, PS/2 (original INT 10h).
43h  Internal only! Video data, character table [EGA, MCGA, VGA].
44h  Internal only! Video data, character fonts [EGA, MCGA, VGA].
45h  Internal. Unused.
     External. Z100 Master 8259, TI Professional PC - IRQ 5,
               Acorn BBC Master -  "OSFILE".
46h  Internal. Hard Disk 1 Drive Parameter Table address. Not code!
     External. Z100 Master 8259, TI Professional PC - IRQ 6,
               Acorn BBC Master - "OSRDCH".
47h  Internal. Unused.
     External. Z100 Master 8259, TI Professional PC - IRQ 7,
               Acorn BBC Master - "OSWRCH", Western Digital WD1002-27x
               SuperBIOS, SQL Base.
48h  Internal. PC JR. cordless keyboard translation table.
     External. Z100 Slave 8259, TI Professional PC - Misc.,
               Acorn BBC Master - "OSNEWL", Western Digital WD1002-27x
               SuperBIOS.
49h  Internal. PC JR. translation table for non-keyboard scan code.
     External. Z100 Slave 8259, TI Professional PC - CRT,
               Acorn BBC Master - "OSASCI".
4Ah  Internal and External. User alarm for AT, PC Convertible, PS/2
     External. Z100 Slave 8259, TI Professional PC - KEYBD,
               Acorn BBC Master - "OSWORD", Tandy 2000 - PrtSc (same as
               INT 05h).
4Bh  Internal. Unused.
     External. Z100 Slave 8259, TI Professional PC - Parallel Port,
               Acorn BBC Master - "OSBYTE", Tandy 2000 Equipment
               Determination (same as INT 11h), CAM SCSI interface
               (moved to INT 4Fh after v1.9), IBM SCSI interface,
               Virtual DMA (VDS) interface.
4Ch  Internal. Unused.
     External. Z100 Slave 8259, TI Professional PC - Clock/Analog,
               Acorn BBC Master - "OSCLI", Tandy 2000 Get Memory Size
               (same as INT 12h).
4Dh  Internal. Unused.
     External. Z100 Slave 8259, TI Professional PC - DISK, IBM M-Audio
               Adapter interface.
4Eh  Internal. Unused.
     External. Z100 Slave 8259, TI Professional PC - Time Of Day Clock.
4Fh  Internal. Unused.
     External. Z100 Slave 8259, TI Professional PC - System Configuration
               Call, CAM SCSI interface (v2.3+).
50h  Internal. (IRQ 0) Relocated by DESQView, IBM 3278, OS/2 v1.x.
     External. TI Professional PC - Fatal Software Error Trap.
51h  Internal. (IRQ 1) Relocated by DESQView, IBM 3278, OS/2 v1.x.
     External. TI Professional PC - Restart Timing Event,
               Tandy 2000 - Keyboard Services (same as INT 16h).
52h  Internal. (IRQ 2) Relocated by DESQView, IBM 3278, OS/2 v1.x.
     External. TI Professional PC - Cancel Timing Event,
               Tandy 2000 - Video Services (same as INT 10h).
53h  Internal. (IRQ 3) Relocated by DESQView, IBM 3278, OS/2 v1.x.
     External. TI Professional PC - SVC interface,
               Tandy 2000 - Serial Communications (same as INT 14h).
54h  Internal. (IRQ 4) Relocated by DESQView, IBM 3278, OS/2 v1.x.
     External. TI Professional PC - Active Task Subroutine,
               Tandy 2000 - Line Printer (same as INT 17h).
55h  Internal. (IRQ 5) Relocated by DESQView, IBM 3278, OS/2 v1.x.
     External. Tandy 2000 - System Clock (same as INT 1Ah).
56h  Internal. (IRQ 6) Relocated by DESQView, IBM 3278, OS/2 v1.x.
     External. Tandy 2000 - Floppy Disk Services (same as INT 13h).
57h  Internal. (IRQ 7) Relocated by DESQView, IBM 3278, OS/2 v1.x.
     External. TI Professional PC - CRT Mapping Hook.
58h  Internal. (IRQ  8) Relocated by DESQView v2.26+,
               (IRQ  0) Relocated by DoubleDOS.
     External. TI Professional PC - System Timer 25ms Hook.
59h  Internal. (IRQ  9) Relocated by DESQView v2.26+,
               (IRQ  1) Relocated by DoubleDOS.
     External. TI Professional PC - Hardware Interrupt Exit Vector,
               GSS Computer Graphics interface.
5Ah  Internal. (IRQ 10) Relocated by DESQView v2.26+,
               (IRQ  2) Relocated by DoubleDOS.
     External. TI Professional PC - System Timer 100ms Hook,
               Entry address for PC Cluster Adapter BIOS.
5Bh  Internal. (IRQ 11) Relocated by DESQView v2.26+,
               (IRQ  3) Relocated by DoubleDOS.
     External. TI Professional PC - Keyboard Mapping Hook,
               PC Cluster Adapter - relocated INT 19h, AT&T Starlan Extended
               NetBIOS interface, MS Network Transport Layer interface.
5Ch  Internal. (IRQ 12) Relocated by DESQView v2.26+,
               (IRQ  4) Relocated by DoubleDOS.
     External. TI Professional PC - Keyboard PAUSE Key Vector,
               TOPS interface, AppleTalk interface, $25 LAN interface,
               IBM 802.2 (LLC) interface.
5Dh  Internal. (IRQ 13) Relocated by DESQView v2.26+,
               (IRQ  5) Relocated by DoubleDOS.
     External. TI Professional PC - Keyboard BREAK Key Vector.
5Eh  Internal. (IRQ 14) Relocated by DESQView v2.26+,
               (IRQ  6) Relocated by DoubleDOS.
     External. TI Professional PC - Keyboard PrtSc Key Vector.
5Fh  Internal. (IRQ 15) Relocated by DESQView v2.26+,
               (IRQ  7) Relocated by DoubleDOS.
     External. TI Professional PC - Keyboard Queueing Vector,
               HP 95LX/100LX/200LX Graphics Primitives.
60h  Internal. Program definable interrupt.
     External. TI Professional PC - System ROM Data Area pointer,
               HP 95LX System Manager interface,  Adaptec and OMTI
               controllers Drive 0 Data (not code), MDEBUG and FTP Packet
               Driver interface, Banyan VINES interface, Atari Portfolio
               interface, etc.
61h  Internal. Program definable interrupt.
     External. TI Professional PC - Factory ROM Data Area pointer,
               HP 95LX System Manager interface, Adaptec and OMTI
               controllers Drive 0 Data (not code), Banyan VINES interface,
               Atari Portfolio interface, PC/TCP Network kernal, etc.
62h  Internal. Program definable interrupt.
     External. TI Professional PC - Option ROM Data Area pointer,
               HP 95LX - used by calculator, Adaptec and OMTI controllers
               Drive 0 Data (not code), MS SQL DBLIBRARY interface,
               FGDRIVER interface, BW-TCP HW Driver and Cswitch interface,
               PC Tools interface, etc.
63h  Internal. Program definable interrupt.
     External. TI Professional PC - Option ROM Data Area pointer,
               HP 100LX - memory mapping funcs, Adaptec and OMTI controllers
               Drive 0 Data (not code), DESQview /X Socket API,
               BW-TCP interface, etc.
64h  Internal. Program definable interrupt.
     External. TI Professional PC - Option ROM Data Area pointer,
               Adaptec controllers Drive 1 Data (not code), Novell NetWare
               Low Level API, BW-NFS interface, etc.
65h  Internal. Program definable interrupt.
     External. TI Professional PC - Option ROM Data Area pointer,
               Adaptec controllers Drive 1 Data (not code), Ad Lib SOUND.COM
               interface, NetSoft DOS-NET interface, Media Vision FM.COM
               interface, etc.
66h  Internal. Program definable interrupt.
     External. TI Professional PC - System Information (not code),
               Adaptec controllers Drive 1 Data (not code), MS Windows 3.x
               VITD.386 (Virtual Interval Timer Device), IBMSND driver
               interface, BIGPAK digital sound driver interface,
               MIDPAK + IBM MIDI sound driver interface, PenDOS interface,
               etc.
67h  Internal. Unused.
     External. TI Professional PC - System Data (not code),
               Adaptec controllers Drive 1 Data (not code), PC Net interface,
               VIDEMS.SYS EMS functions, LIM EMS + QEMM-386 + RM386 +
               Nanosoft MD386 + EEMS interface, VCPI interface, etc.
68h  Internal. Unused.
     External. APPC/PC Network interface, MS Windows debugging kernal, etc.
69h  Internal. Unused.
     External. DECnet DOS + 10NET interface,etc
6Ah  Internal. Unused.
     External. DECnet DOS interface, Super-TCP DOS TSR interface, etc.
6Bh  Internal. Unused.
     External. DECnet DOS interface, NPC NCSI Extended Serial I/O interface,
               Novell NASI/NACS interface, etc.
6Ch  Internal. System Resume Vector [Convertable], DOS v3.2 Real Time Clock
               update.
     External. DECnet DOS network scheduler.
6Dh  Internal. Unused.
     External. DECnet DOS (pre-v2.1) interface, also used by many VGA and
               SVGA adapters as a pointer to data, code, or relocated video
               INTs, etc.
6Eh  Internal. Unused.
     External. DECnet DOS Network Process API.
6Fh  Internal. Unused.
     External. Novell Netware PCOX API, 10NET interface, HP Vectra EX-BIOS
               interface, etc.
  [Note: IRQ 8 through IRQ F apply to the AT and later.]
70h  Internal. (IRQ 8) CMOS Real Time Clock interrupt.
71h  Internal. (IRQ 9) Hardware interrupt (redirected to IRQ 2).
72h  Internal. (IRQ A) Unused.
73h  Internal. (IRQ B) Unused.
74h  Internal. (IRQ C) Pointing device [PS/2].
75h  Internal. (IRQ D) Coprocessor hardware interrupt.
76h  Internal. (IRQ E) Fixed disk hardware interrupt.
77h  Internal. (IRQ F) Power Conservation [Compaq SLT/286].
78h  Internal. Unused.
     External. AutoCAD device interface, UofSalford DBOS DOS extender API,
               TARGA.DEV (SCSI) interface.
79h  Internal. Unused.
     External. AutoCAD device interface, etc.
7Ah  Internal. Unused.
     External. AutoCAD device interface, Novell Netware IPX/SPX interface
               (v2.0a and earlier), IBM 3270 Workstation Program API, etc.
7Bh  Internal. Unused.
     External. AutoCAD device interface, Novell XQL API, Btrieve API, etc.
7Ch  Internal. Unused.
     External. SK-UPPS DLI API, etc.
7Dh  Internal. Unused.
     External. SCSILink interface, etc.
7Eh  Internal. Unused.
     External. IWSBSDRV (MIDI driver) interface, SBOS and MaxSBOS interface,
               etc.
7Fh  Internal. Unused.
     External. IBM 3270 HLL/LL API, IBM XGA and 8514/A Adapter interfaces,
               IBM Touch Screen device driver API.
80h  Internal. Unused.
     External. Used by the BASIC interpreter, Sound Blaster SBSIM and SBFM
               interface, etc.
81h  Internal. Unused.
     External. Used by the BASIC interpreter, Gravis UltraSound interface,
               etc.
82h  Internal. Unused.
     External. Used by the BASIC interpreter.
83h  Internal. Unused.
     External. Used by the BASIC interpreter, JM Pro Tracker interface, etc.
                             ',0
84h  Internal. Unused.
     External. Used by the BASIC interpreter.
85h  Internal. Unused.
     External. Used by the BASIC interpreter.
86h  Internal. Unused.
     External. Transfer to ROM BASIC (relocated INT 18h).
87h  Internal. Unused.
     External. Used by the BASIC interpreter.
88h  Internal. Unused.
     External. Used by the BASIC interpreter.
89h  Internal. Unused.
     External. Used by the BASIC interpreter.
8Ah  Internal. Unused.
     External. Used by the BASIC interpreter.
8Bh  Internal. Unused.
     External. Used by the BASIC interpreter.
8Ch  Internal. Unused.
     External. Used by the BASIC interpreter.
8Dh  Internal. Unused.
     External. Used by the BASIC interpreter.
8Eh  Internal. Unused.
     External. Used by the BASIC interpreter.
8Fh  Internal. Unused.
     External. Used by the BASIC interpreter.
90h  Internal. Unused.
     External. Used by the BASIC interpreter.
91h  Internal. Unused.
     External. Used by the BASIC interpreter.
92h  Internal. Unused.
     External. Used by the BASIC interpreter, Da Vinci eMail Dispatcher
               interface, etc.
93h  Internal. Unused.
     External. Used by the BASIC interpreter.
94h  Internal. Unused.
               External. Used by the BASIC interpreter, PCM (sound) driver
               interface, etc.
95h  Internal. Unused.
     External. Used by the BASIC interpreter.
96h  Internal. Unused.
     External. Used by the BASIC interpreter.
97h  Internal. Unused.
     External. Used by the BASIC interpreter.
98h  Internal. Unused.
     External. Used by the BASIC interpreter.
99h  Internal. Unused.
     External. Used by the BASIC interpreter.
9Ah  Internal. Unused.
     External. Used by the BASIC interpreter.
9Bh  Internal. Unused.
     External. Used by the BASIC interpreter.
9Ch  Internal. Unused.
     External. Used by the BASIC interpreter.
9Dh  Internal. Unused.
     External. Used by the BASIC interpreter.
9Eh  Internal. Unused.
     External. Used by the BASIC interpreter.
9Fh  Internal. Unused.
     External. Used by the BASIC interpreter.
A0h  Internal. Unused.
     External. Used by the BASIC interpreter.
A1h  Internal. Unused.
     External. Used by the BASIC interpreter.
A2h  Internal. Unused.
     External. Used by the BASIC interpreter.
A3h  Internal. Unused.
     External. Used by the BASIC interpreter.
A4h  Internal. Unused.
     External. Used by the BASIC interpreter, Right Hand Man API, etc.
A5h  Internal. Unused.
     External. Used by the BASIC interpreter.
A6h  Internal. Unused.
     External. Used by the BASIC interpreter.
A7h  Internal. Unused.
     External. Used by the BASIC interpreter.
A8h  Internal. Unused.
     External. Used by the BASIC interpreter.
A9h  Internal. Unused.
     External. Used by the BASIC interpreter.
AAh  Internal. Unused.
     External. Used by the BASIC interpreter.
ABh  Internal. Unused.
     External. Used by the BASIC interpreter.
ACh  Internal. Unused.
     External. Used by the BASIC interpreter.
ADh  Internal. Unused.
     External. Used by the BASIC interpreter.
AEh  Internal. Unused.
     External. Used by the BASIC interpreter.
AFh  Internal. Unused.
     External. Used by the BASIC interpreter.
B0h  Internal. Unused.
     External. Used by the BASIC interpreter.
B1h  Internal. Unused.
     External. Used by the BASIC interpreter.
B2h  Internal. Unused.
     External. Used by the BASIC interpreter.
B3h  Internal. Unused.
     External. Used by the BASIC interpreter, ZIPKEY interface, etc.
B4h  Internal. Unused.
     External. Used by the BASIC interpreter.
B5h  Internal. Unused.
     External. Used by the BASIC interpreter.
B6h  Internal. Unused.
     External. Used by the BASIC interpreter.
B7h  Internal. Unused.
     External. Used by the BASIC interpreter.
B8h  Internal. Unused.
     External. Used by the BASIC interpreter.
B9h  Internal. Unused.
     External. Used by the BASIC interpreter.
BAh  Internal. Unused.
     External. Used by the BASIC interpreter.
BBh  Internal. Unused.
     External. Used by the BASIC interpreter.
BCh  Internal. Unused.
     External. Used by the BASIC interpreter.
BDh  Internal. Unused.
     External. Used by the BASIC interpreter.
BEh  Internal. Unused.
     External. Used by the BASIC interpreter.
BFh  Internal. Unused.
     External. Used by the BASIC interpreter.
C0h  Internal. Unused.
     External. Used by the BASIC interpreter,
               AMI BIOS - Drive 0 Data (not code!).
C1h  Internal. Unused.
     External. Used by the BASIC interpreter,
               AMI BIOS - Drive 0 Data (not code!).
C2h  Internal. Unused.
     External. Used by the BASIC interpreter,
               AMI BIOS - Drive 0 Data (not code!).
C3h  Internal. Unused.
     External. Used by the BASIC interpreter,
               AMI BIOS - Drive 0 Data (not code!).
C4h  Internal. Unused.
     External. Used by the BASIC interpreter,
               AMI BIOS - Drive 1 Data (not code!).
C5h  Internal. Unused.
     External. Used by the BASIC interpreter,
               AMI BIOS - Drive 1 Data (not code!).
C6h  Internal. Unused.
     External. Used by the BASIC interpreter,
               AMI BIOS - Drive 1 Data (not code!).
C7h  Internal. Unused.
     External. Used by the BASIC interpreter,
               AMI BIOS - Drive 1 Data (not code!).
C8h  Internal. Unused.
     External. Used by the BASIC interpreter.
C9h  Internal. Unused.
     External. Used by the BASIC interpreter.
CAh  Internal. Unused.
     External. Used by the BASIC interpreter.
CBh  Internal. Unused.
     External. Used by the BASIC interpreter.
CCh  Internal. Unused.
     External. Used by the BASIC interpreter.
CDh  Internal. Unused.
     External. Used by the BASIC interpreter.
CEh  Internal. Unused.
     External. Used by the BASIC interpreter.
CFh  Internal. Unused.
     External. Used by the BASIC interpreter.
D0h  Internal. Unused.
     External. Used by the BASIC interpreter.
D1h  Internal. Unused.
     External. Used by the BASIC interpreter.
D2h  Internal. Unused.
     External. Used by the BASIC interpreter.
D3h  Internal. Unused.
     External. Used by the BASIC interpreter.
D4h  Internal. Unused.
     External. Used by the BASIC interpreter, PC-MOS/386 interface.
D5h  Internal. Unused.
     External. Used by the BASIC interpreter.
D6h  Internal. Unused.
     External. Used by the BASIC interpreter.
D7h  Internal. Unused.
     External. Used by the BASIC interpreter.
D8h  Internal. Unused.
     External. Used by the BASIC interpreter.
D9h  Internal. Unused.
     External. Used by the BASIC interpreter.
DAh  Internal. Unused.
     External. Used by the BASIC interpreter.
DBh  Internal. Unused.
     External. Used by the BASIC interpreter.
DCh  Internal. Unused.
     External. Used by the BASIC interpreter.
DDh  Internal. Unused.
     External. Used by the BASIC interpreter.
DEh  Internal. Unused.
     External. Used by the BASIC interpreter.
DFh  Internal. Unused.
     External. Used by the BASIC interpreter.
E0h  Internal. Unused.
     External. Used by the BASIC interpreter, Desk Mate (Tandy) Desk
               Executive API, CP/M-86 + Concurrent CP/M + DR Multiuser DOS
               interface, PCROBOTS interface, etc.
E1h  Internal. Unused.
     External. Used by the BASIC interpreter.
E2h  Internal. Unused.
     External. Used by the BASIC interpreter.
E3h  Internal. Unused.
     External. Used by the BASIC interpreter.
E4h  Internal. Unused.
     External. Used by the BASIC interpreter.
E5h  Internal. Unused.
     External. Used by the BASIC interpreter.
E6h  Internal. Unused.
     External. Used by the BASIC interpreter, Linux DOSEMU interface, etc.
E7h  Internal. Unused.
     External. Used by the BASIC interpreter.
E8h  Internal. Unused.
     External. Used by the BASIC interpreter.
E9h  Internal. Unused.
     External. Used by the BASIC interpreter.
EAh  Internal. Unused.
     External. Used by the BASIC interpreter.
EBh  Internal. Unused.
     External. Used by the BASIC interpreter.
ECh  Internal. Unused.
     External. Used by the BASIC interpreter.
EDh  Internal. Unused.
     External. Used by the BASIC interpreter.
EEh  Internal. Unused.
     External. Used by the BASIC interpreter.
EFh  Internal. Unused.
     External. Used by the BASIC interpreter.
F0h  Internal. Unused.
F1h  Program definable interrupt. Common ISDN API.
F2h  Program definable interrupt.
F3h  Program definable interrupt.
F4h  Program definable interrupt.
F5h  Program definable interrupt.
F6h  Program definable interrupt.
F7h  Program definable interrupt.
F8h  Program definable interrupt.
F9h  Program definable interrupt.
FAh  Program definable interrupt.
FBh  Program definable interrupt.
FCh  Program definable interrupt.
FDh  Program definable interrupt.
FEh  Internal only! Reserved interrupt.
FFh  Internal only! Reserved interrupt.
