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1988-09-12
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AT-SLOW.DOC
There are no implied warranties or guarantees with this software. To the best
of our knowledge it is free from defect.
Provided by PCGURU BBS
Tested on 9/08/88 by David R. Foley
PC GURU BBS (617) 783-5154 24 Hours 2400bps
AT-SLOW
PC-AT High Performance Slowdown
By David Keil
AT-SLOW is a utility which when loaded will use the high
resolution timer found in a PC-AT or close clone to slow down
games and other programs which run to fast on PC-AT's.
This program is hardware dependent and requires a PC-AT or
close clone to operate. AT-SLOW uses the AT's real time clock
found at interrupt 70h to slow down the AT's speed.
Using the real time clock's interrupt has two advantages
over the usual use of the normal PC's timer.
1 - The high resolution timer occurs 1024 times a second (as
opposed to 18.2 with the normal timer). This provides a much
smoother slow down than with the normal timer. This also
provides a higher degree of performance reduction.
2 - Since this slow down uses interrupt 70h and only AT's use
this interrupt, programs don't know to re-vector it. So
programs that don't work with mormal slow down programs
will work with AT-SLOW.
Using AT-SLOW:
The command for using AT-SLOW is
at-slow [/delay][/d][/h]
Where:
/delay = Amount of performance reduction.
/d = Disables AT-SLOW
/h = Show brief help message
The range of values for delay is 1-1000. Values of 300-400
on 286 machines is usually adequate. Care must be used when using
values over 400 (over 800 on 386 machines) as the computer will
be slowed down to the point of uselessness where it appears to be
locked up or if slowed down enough will lock up. If this occurs
the only solution is to re-boot the computer.
Once installed AT-SLOW can be disabled by using the /d
option. This option will disable the timer interrupt and return
the computer to normal speed. AT-SLOW can be removed with TSR
management programs such as MARK & RELEASE however care must be
taken to disable AT-SLOW first or the interrupt may remain active
and this will cause about a 10% reduction in performance. The
program uses very little memory however and when disabled does
not effect performance so leaving it in memory should not be of
great concern.
To reactivate AT-SLOW after disabling it or to change the
delay value just re-run AT-SLOW with the new delay value.
If you find AT-SLOW useful:
This program is copyrighted and may only be distributed
in unmodified form and with this DOC file included. Absolutely no
money may be charged for distribution of this program. If you
were charged for the disk that contained this software and have
the name of the company that did so please contact me.
A lot of time went into the finding of information which
enabled the writing of AT-SLOW, the Program itself is not that
complex. So if you find this program useful (and I'm sure you
will) and would like to support the development of more PC-AT
(and other high performance computers) related software
(here it comes). Please send a contribution of $5.00 payable to:
Better Software Co.
10 W. Wilburn Ave.
Greenville, S.C. 29611
Home (803) 295-4971
BBS (803) 269-7899 after 1st of July (1200-2400)
after 1st of August (1200-9600)
EOF