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Frostbyte's 1980s DOS Shareware Collection
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NWUG
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SCROLOCK.ZIP
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SCROLOCK.DOC
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1991-03-14
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SCROLL LOCK
-----------
INTRODUCTION
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SCROLOCK.COM is a small memory-resident (TSR) utility for IBM and
compatible PC's that does one thing: makes the Scroll Lock key
functional. Normally when using the TYPE, DIR, and other DOS
commands, information scrolls off the screen too fast for you to
read. You can press Ctrl-S to pause the scrolling, but that's
only a partial solution. SCROLOCK make the Scroll Lock key do
what it should do. Press it once and the screen pauses...press it
again to resume scrolling.
SCROLOCK works by constantly intercepting the video BIOS interrupt
(INT 10h), checking the status of the Scroll Lock. If the key is
not engaged, processing continues as usual with virtually no
delay. If the key IS engaged, the system will wait until it is
released before continuing. Only the foreground application is
halted by SCROLOCK, and only when it is updating the screen.
HARDWARE REQUIREMENTS
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SCROLOCK works on any IBM-compatible computer with DOS 2.1 or a
later version. It has no special memory or monitor requirements.
USING SCROLOCK
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To activate SCROLOCK, simply type SCROLOCK at the DOS prompt, or
include the line in your AUTOEXEC.BAT or other batch file. It is
useful in particular with programs and languages (like
BASICA/GWBASIC) that do not recognize a "control-S" keypress to
halt a long screen listing.
NOTE: SCROLOCK should be loaded only once during a session at
the computer. If you invoke it a second time, you will just eat
up another 400 bytes or so of memory for no good purpose. You can
use a TSR manager like INSTALL/REMOVE or MARK/RELEASE or POPDROP
to reclaim the memory used by the program and disable it. (The
active part of the program after installation is actually less
than 32 bytes long. The other 300-odd bytes it uses are basically
DOS overhead.)
After loading SCROLOCK, simply press the Scroll Lock key to pause
any data scrolling too fast for you to read. To resume scrolling,
press the key once more. You may repeat this process as needed.
Because of the way it works, SCROLOCK will always pause the screen
BETWEEN the output of two characters, not DURING the output of a
single character, eliminating this source of confusion.
DONATIONS
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This is my first attempt at "publishing" a PC utility program.
Feel free to use it and to give copies to whomever you choose, but
please also include this documentation file with it. If you upload
it to another BBS system, upload the two files together as a .ZIP
or .ARC or similar combined file.
I do not demand that you pay me money if you find the program
useful, but if you would like to contribute $5.00 or so it would
certainly encourage me to attempt other, more ambitious projects.
Send any contributions to:
Daniel Schwartz
75 E. 190 St. #1D
Bronx, NY 10468