Hi all, I've built a pure DOS machine with a view to making it as fast as possible, certainly want it to be faster than modern machines running Windows XP etc... Now then, my machine is very cleanly built and setup, no rubbish, TSRs and utilities except emm386, mouse driver, smartdrv and cdrom driver. I have written a small DOS program that does lot's of floating point math stuff which takes 2.2Secs to complete on my other Windows 2000 AMD 1700 machine. Testing the very same program on my "Ultimate DOS Machine" results in a time of 7.4Secs!!! Almost 4 times slower than the W2K machine. I also tried booting my DOS machine from a DOS6.22 floppy and the program runs in 3.3Secs, alot faster (WHY!!!!) but still slower than the W2K machine. I was kinda hoping for my DOS machine to be around twice (at least) the speed of the W2K machine. Any thoughts??? Cheers all, Jez. By the way, although I've got a 128MB 266DDR DIMM installed, DOS only seems to see 64MB of it, not a problem I don't think, but interesting. :-)

>> By the way, although I've got a 128MB 266DDR DIMM installed, DOS only seems to see 64MB of it, not a problem I don't think, but interesting. :-) This means the version of DOS you are using is too old. This doesn't happen at all on some newer versions of DOS, such as MS-DOS 7.10 Standalone Version.

I must admit that I didn't know that MSDOS 7.1 existed, I look out for it, might even improve my speed problems. Thanks.