ianj@ijpc.UUCP (Ian Justman) (08/15/90)
Is there any way of speeding up an older 4.77MHz XT-class system short of getting another motherboard, an accelerator card, or other what-not? I would appreciate any input.
ralphs@halcyon.wa.com (Ralph Sims) (08/17/90)
ianj@ijpc.UUCP (Ian Justman) writes: > Is there any way of speeding up an older 4.77MHz XT-class system short of > getting another motherboard, an accelerator card, or other what-not? I would > appreciate any input. You could add a fairly inexpensive what-not: A V20 chip to replace the 8088 that's in there. Also, here's a little snippet to add a 1/10th of an SI or so. Run this through debug. 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00 B0 00 B0 00 B0 00 B0 00 B0 00 B0 00 B0 00 B0 E 0B30 00 B0 00 B0 00 B0 00 B0 00 B0 00 B0 00 E6 41 CD E 0B40 20 20 0D 0A 53 70 65 65 64 73 74 65 72 20 56 65 E 0B50 72 73 69 6F 6E 20 31 2E 30 30 42 20 44 72 69 76 E 0B60 65 72 20 69 6E 73 74 61 6C 6C 65 64 2E 0D 0A 28 E 0B70 43 29 43 6F 70 79 72 69 67 68 74 20 31 39 38 37 E 0B80 2C 20 4D 69 63 72 6F 20 54 45 43 48 20 53 79 73 E 0B90 74 65 6D 73 3B 20 41 4C 4C 20 52 49 47 48 54 53 E 0BA0 20 52 45 53 45 52 56 45 44 0D 0A 24 RCX 0AAC W Q ////clip here//// Someone may be able to disassemble this and compact it a bit. -- "Reality is for people who lack imagination."
dmurdoch@watstat.uwaterloo.ca (Duncan Murdoch) (08/18/90)
In article <a0u1N4w162w@halcyon.wa.com> ralphs@halcyon.wa.com (Ralph Sims) writes: >Also, here's a little snippet to add a 1/10th of an SI or so. Run this >through debug. Call it something and then debug <something > >////clip here//// > > N SPEEDSTR.COM I certainly wouldn't recommend that anyone run this program. What it does is reprogram the timer chip to change the rate of RAM refresh. However, it tries to make itself appear as if it's doing much more - all those repeated bytes don't do a thing, and it prints a misleading message about installing a driver. I didn't look into it in enough detail to know whether the reprogramming it does is safe or not - the fact that it's trying to deceive is enough reason to avoid it. Duncan Murdoch
ralphs@halcyon.wa.com (Ralph Sims) (08/19/90)
dmurdoch@watstat.uwaterloo.ca (Duncan Murdoch) writes: > In article <a0u1N4w162w@halcyon.wa.com> ralphs@halcyon.wa.com (Ralph Sims) wr > >Also, here's a little snippet to add a 1/10th of an SI or so. Run this > >through debug. Call it something and then debug <something > > > >////clip here//// > > > > N SPEEDSTR.COM > > I certainly wouldn't recommend that anyone run this program. What it does > is reprogram the timer chip to change the rate of RAM refresh. However, it > tries to make itself appear as if it's doing much more - all those repeated > bytes don't do a thing, and it prints a misleading message about installing > a driver. > > I didn't look into it in enough detail to know whether the reprogramming it > does is safe or not - the fact that it's trying to deceive is enough > reason to avoid it. > > Duncan Murdoch I can empathize with your concerns. First, I did not write the utility and I am not a hardware hacker (at least via software). This thing has been used on a number of different machines with a variety of BIOS chips and video adapters. While the extra code may be superfulous, the intent was to confuse the casual fellow who would dis-assemble it for whatever reason. The utility functions as a TSR and lurks somewhere in the video RAM (at least I _think_ that's where it resides, as PMAP and MAPMEM haven't told me an address). I have used it for three years without any known problems. I guess I should have included my usual 'mileage may vary...caveat everybody...void where prevented' tag. Thanks for expressing your concerns and reminding us that TANSTAAFL is in effect. -- "Reality is for people who lack imagination."