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SCRNKY.DOC
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1987-06-16
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5KB
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101 lines
SCRNKY.DOC for the IBM PC/XT & PCJR - 1987 by Ocean
KEYBOARD LOCK WITH AUTO 3 MINUTE SCREEN BLANKER
These utilities, SCRNOFF3.ASM & KYLOCK.ASM, comprise a 2 part utilities set.
Each must be assembled, linked and converted from exe to executable com files
separately. The com files are provided on this disk for the convenience of
those without an assembler. These utilities were developed to work with POPUP
DESKSET (TM) and work together to automatically blank the screen after 3
minutes of keyboard inactivity. Pressing any key unblanks the screen and
pressing ALT-O toggles the auto screen blanker on & off. In addition, the
operator has the option of using a "hotkey" (ALT-K) to freeze the keyboard &
blank the screen whenever desired. After the "hotkey" is used to activate the
second part of this set, the operator must then enter a password. The keyboard
remains locked and the screen blanked until the password is reentered. The
password may be changed each time the operator invokes the utility to freeze
the keyboard. Once a password is chosen, of course, it must be reentered
exactly as entered to unlock the keyboard and unblank the screen. All keys and
their combinations enterable from the keyboard may be used not to exceed 64.
The routine may be aborted before the password is entered by pressing the
escape key. Since the ctrl-alt-del warm start function is disabled by trapping
that key combination, once entered, nothing but a power off/on cold start will
unlock the keyboard for anyone without the password. The password is not
displayed on the screen. The backspace key may be used as an editing key on
entering and reentering the password. Pressing enter/return enters the
password. Reentering the password to unlock the keyboard and unblank the
screen may be attempted repeatedly simply by pressing the enter/return key and
starting over. In addition, the "hotkeys" used to invoke the various modules
of POPUP DESKSET(TM) have been trapped and may not be included in a password.
These are: ALT-W, ALT-U,ALT-A, ALT-D, ALT-X, ALT-V, ALT-C, & ALT-F10. When
used with POPUP DESKSET(TM), SCRNOFF3.COM should be loaded after pop alarm &
pop date. Then, load KYLOCK.COM just before pop any. When used with other
"terminate but stay resident" programs, experiment with the order of loading.
If not used with POPUP DESKSET(TM) or any other "TSR", simply load both, one
after the other.
COMMAND SUMMARY:
ALT-O --------- TOGGLES AUTO 3 MINUTE SCREEN BLANKER ON/OFF.
ALT-K --------- INVOKES MAIN PROGRAM WHICH IMMEDIATELY BLANKS
THE SCREEN AND ALLOWS THE USER TO ENTER A
PASSWORD THAT LOCKS THE KEYBOARD UNTIL
REENTERED.
BACKSPACE ----- EDIT PASSWORD ENTRY.
ESC --------- ABORT! (After ALT-K & prior to hitting
enter/return.)
ENTER --------- ENTERS PASSWORD. ALSO ABORTS IF NO KEYS HAVE
BEEN PRESSED TO ENTER A PASSWORD.
*********************** --- WARNING! --- ***********************
When the screen is blanked by this program, it is still possible to read the
screen, due to its persistence, with the naked eye or photographic film.
Darken your room or office and you can see this for yourself. To increase
security, overlay a resident calendar ,help menu/table, or some other type of
routine that you have in memory before invoking this keyboard lock routine.
******************************************************************************
REFERENCE: PC Magazine, Volume 5 #16 page 302; "EGA SCREEN BLANKER"
; by Charles Petzold
PC magazine, Volume 5 #22 page 285; "FREEZE OUT FILE FILCHERS"
; by Jeff Prosise
BIBLIOGRAPHY: "INTRODUCING PC-DOS and MS-DOS (A GUIDE FOR BEGINNING and
ADVANCED USERS)"
by Thomas Sheldon
"COMPUTE'S BEGINNER'S GUIDE to MACHINE LANGUAGE on the IBM PC &
PCJR"
by Christopher D. Metcalf and Marc B. Sugiyama
"COMPUTE'S MAPPING the IBM PC and PCJR"
by Russ Davies
"IBM PCJR ASSEMBLER LANGUAGE"
by David C. Willen
"MS-DOS DEVELOPER'S GUIDE"
by John Angermeyer & Kevin Jaeger
"MACRO-86 ASSEMBLY LANGUAGE PROGRAMMING"
by Lawrence P. Larsen (Heath/Zenith Educational Systems)
Use these utilities at your own risk!
If you find this utilities set useful, send $1.50 payment to:
Ocean
357 Richmond Ave.
San Jose, CA 95128-2337
THANK YOU!