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Simtel MSDOS 1992 December
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simtel1292_SIMTEL_1292_Walnut_Creek.iso
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sysutl
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calcqf.arc
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CALCQF.DOC
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1988-06-28
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CalcQF by Ken Hipple (CIS:74076,2331) and Conrad Smith (76701,107)
V1.0 Mississippi Data Equipment Co.
625C Lakeland East Drive
Jackson, MS 39208 (601) 932-6332
This program calculates and sets the optimum memory refresh rate for your
machine. It will then create a short .COM file that you can run to quickly
set the refresh rate. The memory refresh concept is from an article by
Brian Roemmele in the 7/88 issue of PC Magazine. The .COM file produced
is the same as the QFRESH.COM program from that article. Please see that
article for a thorough discussion of memory refresh rates.
NOTE: It is possible that your machine will 'hang' before the point
CalcQF considers optimum is reached. This will not harm your
machine but you will have to re-boot.
Switches:
/C - Calculate the optimum memory refresh rate. /I, /O and /T imply /C
/I - change the default Increment rate of 16. In general, larger values
will produce numerically higher optimum rates and smaller values
will produce lower ones
/O - don't estimate the Original refresh rate.
/T - set the Tolerance. The default value is 0.00001. This determines what
rate CalcQF considers optimum. Larger values (i.e. 0.01) should produce
numerically lower optimum rates and smaller values (i.e. 0.000001)
should produce higher ones.
/S - Skip the calculation phase and go straight to file creation.
Do not press any keys while this program is running as this can affect
the calculations. Some TSRs and device drivers may also affect them.
Because of this you may want (or need) to run CalcQF with nothing loaded
into memory. The rate referred to as the original rate is the refresh
rate in effect when CalcQF was started. The rate CalcQF says is the best
rate is really only an approximation but it should be close to the best rate
for any given application. At the very least it will provide you a good
starting point for further experimenting.