Specifications

D:\D\inter61a\INTERRUP.A Saturday, January 08, 2011 11:31 AM

N - network, n - non-traditional input devices,

O - other operating systems,

P - printer enhancements, p - power management,

Q - DESQview/TopView and Quarterdeck programs,

R - remote control/file access, r - runtime support,

S - serial I/O, s - sound/speech,

T - DOS-based task switchers/multitaskers, t - TSR libraries

U - resident utilities, u - emulators,

V - video, v - virus/antivirus,

W - MS Windows,

X - expansion bus BIOSes, x - non-volatile config storage

y - security, * - reserved (and not otherwise classified)

--------C-00---------------------------------

INT 00 C - CPU-generated - DIVIDE ERROR

Desc: generated if the divisor of a DIV or IDIV instruction is zero or the

quotient overflows the result register; DX and AX will be unchanged.

Notes: on an 8086/8088, the return address points to the following instruction

on an 80286+, the return address points to the divide instruction

an 8086/8088 will generate this interrupt if the result of a division

is 80h (byte) or 8000h (word)

SeeAlso: INT 04,OPCODE "AAD"

--------G-00---------------------------------

INT 00 - Zenith - ROM DEBUGGER

Desc: invokes the ROM Debugger when at the BIOS level; equivalent to

pressing Ctrl-Alt-Ins on booting.

Note: since DOS revectors INT 00, it is necessary to restore this vector to

its original ROM BIOS value in order to invoke the debugger once DOS

loads

SeeAlso: INT 03"Columbia"

--------C-01---------------------------------

INT 01 C - CPU-generated - SINGLE STEP

Desc: generated after each instruction if TF (trap flag) is set; TF is

cleared on invoking the single-step interrupt handler

Notes: interrupts are prioritized such that external interrupts are invoked

after the INT 01 pushes CS:IP/FLAGS and clears TF, but before the

first instruction of the handler executes

used by debuggers for single-instruction execution tracing, such as

MS-DOS DEBUG's T command

SeeAlso: INT 03"CPU"

--------C-01---------------------------------

INT 01 C - CPU-generated (80386+) - DEBUGGING EXCEPTIONS

-4-

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