INTERVUE V1.4
January, 1993
Copyright Hackensack, 1992, 1993


INTERVUE is a viewer for the Interrupt List maintained by Ralf Brown.
The program is Public Domain Software and may be freely copied and
distributed. The Interrupt List is avaliable for downloading from
CompuServe and numerous other BBS's. The files are named INTnnA.ZIP,
INTnnB.ZIP, and INTnnC.ZIP (nn = current release no.).

INTERVUE is provided as a 'no frills' alternative to the commercial
Interrupt List viewers.

Version 1.4 contains a revised search alogrithm for the List entries
and several bug fixes.

INTERVUE is designed to be backward and foward compatible with the
Interrupt List releases, subject to the following constraints:

The Summary File format must be compatible with release 32.
The individual List files size must not exceed 6 segments (393Kb).
The number of List files must not exceed 12.
The INTERRUP.A file header format must be consistent with release 32.

To install INTERVUE, first copy the Interrupt List files, INTnnA.ZIP and
INTnnB.ZIP, to a subdirectory on the fixed disk and UNZIP them. Next, use
INTPRINT to create the Summary File (INTERRUP.SUM) with the following
command:

INTPRINT -sINTERRUP.SUM -m -i INTERRUP.A nul

Copy INTERVUE to the Interrupt List directory and execute the program.
The INTERRUP.SUM file serves as the menu for accessing the function
descriptions contained in the Interrupt List files. To run INTERVUE from
a search path, add the following command to the AUTOEXEC.BAT file:

set intervue = drv:\path

The 'drv:\path' is the drive and path where the Interrupt List files are
located. INTERVUE may then be placed in any active search path.

The following keys are active within the INTERVUE text display window:
Home, End, PageUp, PageDn, UpArrow, DnArrow, Esc, F1, F2, F3, & Enter.

INTERVUE is written in 8086 assembler, uses conventional memory (640Kb)
only, compatible with DOS 2.0 & >, RSIS compliant (DESQview aware), and
is compatible with both mono and color video. Requires 3Mb disk space
for the Interrupt List files (unzipped). INTERVUE has no command line
parameters, does not use a setup file, and makes no disk writes.

Search Alogrithm:

At initialization, INTERRUP.A is opened and the beginning text read to
build an array mapping Int & Fct to the INTERRUP file extension. Next,
INTERRUP.SUM is read into the file buffer and displayed as a menu. When
a function is selected (Enter), the List file with the Int & Fct is read
into the buffer and searched for a match.

The search string is formed from the Summary file entry by re-creating
the List file description line (three format variations). The List
file description line does not contain the Fct & Sub, so a verify string
is created to check the List file dashed line above the description for
Int, Fct & Sub. A hit is returned from verify if either a match is
found, or if Int, Fct & Sub are absent from the dashed line above the
description (some with Int only are missing). The verify compare allows
List file formatting fluctuations of + or - 5 bytes.

The only observed search problem occurs from identical entries (Int, Fct,
Sub, & description) in the Summary file. The search will always find the
first of these entries in the List file. Use of F3 (next match) will
reveal all of the subsequent identical description entries in the List file,
which will show unique values in BX or other registers. With the 'feature'
documented, and with awareness of how the search works, I consider this
to be a minor inconvience.

The List file is always searched sequentially from the beginning in order
to count the newlines and display the tally. No pointers are used with
the List files, and no binary search techniques are used. The file buffer
segment offset is incremented by one following each byte compare, and
tested for zero to identify segment boundaries. The aux timer vector is
unhooked/hooked and start/end crit section (2F 16 81-82 & 15 DE 1C-1B) is
called for file reads and the search. The file reads are 8000h, with a
compare of AX, CX for eof.

Memory is released, retaining 16kb for the program, and 6 segs allocated
for the file buffer. Errors trapped are mem allocation, file too big, file
not found, and crit.


The INTERVUE program is provided by Hackensack, the publisher of INTRCPT,
a Windows\Dos Interrupt trapper and real-time debugger. For information
on INTRCPT and discounts avaliable to Interrupt List users, contact
Hackensack, PO Box 181386, Arlington, TX 76096 or CompuServe 76570,2752.

Please report any INTERVUE bugs or problems, and upgrade suggestions.

Thanks,
Bob Williamson
CIS 76570,2752