The procedure is to check the standard mapped upper memory area in 2 K increments for existing code. Each Option ROM has a header that, amongst other things (jump to code start, and Option ROM identifier) specifies the ROM size in 512 bytes blocks. Then you need to perform an 8-bit checksum of all …

Hi Martin, I've been using HWiNFO since 1998 or so and I always liked it. You have some good programming skills! However, I recently downloaded HWiNFO v6.1.1 and since I am using an unusual computer, please check this: hwinfo.jpg The controller display appears to be weird. The main computer is an …

You have an exceptionally trained eye! Indeed it is from a Compaq SLT 386/20MHz that was my first laptop in the mid 90s (a bit late, I know). Unfortunately the laptop died back in 2000 (power supply failure) and I have sourced the keyboard, exchanged the cable to a standard AT one. I've kept it for …

HardwareExtreme , I am running MS-DOS 6.22 on this machine, on HD0. Everything is perfectly configured for MS-DOS games and low-level programming work. However, on HD1, I am planning to install a copy of Windows 98 just to see the AMD 5x86 CPU at work. By the way, it arrived and I have installed it …

Than you all for your appreciation of this 486 class machine. gerwin , I really like silent computers, but I also like the sound of the actuator moving on the platters. So this is what I am mostly aiming for: no (or less - undervolted) fans, big heatsinks, and low-noise spindle motor hard discs. …

Thank you for this great explanation regarding the computing power differences between the Deschutes core Pentium II at 400MHz and Katmai core Pentium III at 550MHz. Now I am 100% positive that I will use the Katmai CPU for this build. I have also sourced 512Mb of PC-100 RAM "new" (as in never used) …

The fact is that I am having a very nice pristine Intel SR440BX board that accepts either Slot 1 Pentium II or Pentium III processors, up to 550MHz. I am having both, a Pentium II 400MHz and a Pentium III 550MHz. I am not sure what is the difference in computing power between them, but as soon as I …

It is a Russian made 6H23P tube. It's European equivalent would be the E88CC tube.

Hi, Tertz , I am not very much into benchmarks and performance testing. I just did the small test battery just to have an idea of what kind of machine I managed to build. But I surely did read parts of the thread you indicated to me. Thank you! If I will find some spare time in the close future, I …

Hello, Nice to see you guys, all interested into old hardware! I am also collecting old stuff and I'm happy I found this Forum. Long story short: I have a strong MS-DOS background and I love the "magic" of old computers. Long story long: I had my first real PC in 1993. It was an 80386SX/25MHz made …

Hi, I am having the same Tomato 4DPS board in my 486 machine. The specifications are as follows: Intel 80486DX4/100MHz CPU with Write-Through L1 cache, 64Mb RAM, 256K cache RAM, Matrox Millenium 2 with 4Mb RAM, 4.3Gb Quantum Fireball disc drive. I have ran the System Speed Test program, and it came …