Specifications

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

INT 03 C - CPU-generated - BREAKPOINT

Desc: generated by the one-byte breakpoint instruction (opcode CCh)

Notes: used by debuggers to implement breakpoints, such as MS-DOS DEBUG's G

command

also used by Turbo Pascal versions 1,2,3 when {$U+} specified

return address points to byte following the breakpoint instruction

called by Novell DOS 7 EMM386 after displaying an exception error

message (GPF, illegal opcodes, etc.) and before waiting for user

input

called by QEMM-386 if the user presses 'I' (undocumented) when prompted

after an exception error message

SeeAlso: INT 01"CPU"

--------G-03---------------------------------

INT 03 - Columbia PCs (desktop,VP portables) - ROM DEBUGGER

Desc: invokes the ROM Debugger if INT 03 has not been revectored; equivalent

to pressing Esc on booting.

SeeAlso: INT 00"Zenith",INT 03"Realia"

--------G-03---------------------------------

INT 03 - Realia COBOL - DEBUGGER SUPPORT

Note: Realia COBOL checks for a signature eight bytes prior to the interrupt

handler when it starts up

BUG: if the offset of the INT 03 vector is less than 8, the compiler and

all executables generated by it will crash the system

SeeAlso: INT 03"Columbia"

--------G-03---------------------------------

INT 03 U - Watcom WVIDEO, Watcom WD - OUTPUT DEBUGGING MESSAGE

STACK: DWORD selector

DWORD offset of ASCIZ message to display

Notes: the INT 03h instruction which invokes the debugger must be followed by

a JMP SHORT and the signature string "WVIDEO"

to check whether this interface is available, define a public byte

variable named ___WD_Present, which the debugger will set to 01h

before running the program

SeeAlso: AX=0910h

--------U-03---------------------------------

INT 03 - DTown Utilities - POP UP

Program: DTown Software Development's DTown Utilities contains various tools

which are useful to programmers, such as a memory viewer and

disassembler

Note: DTU pops up on INT 03 (if not hooked by a debugger) to allow the

user to inspect memory or code when the machine crashes; various

-6-

http://www.foxitsoftware.com For evaluation only.