Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-11-02, 15:59

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thank you. It seems your DX2-66 runs with clock tripled, so according to its data sheet it is basically jumpered wrong. Try to find where it has the 2x/3x jumper. Compare it with the possibilities in your mainboard manual. However, since I also think that it is binned, why not continuing at this …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-11-02, 15:50

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't think it has anything to do with the processor. Your description lets me think about a graphics card which is just not good enough. We'd like to know more about model and RAMDAC. I am using an ARK1000PVL with 1MB of RAM. It's currently set to 0 Wait states. The strange thing is all of the …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-11-01, 23:56

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

And one last thing. I had an Intel 486DX4-100 in another machine. I figured I would test it. I am seeing weird things. Maybe the heatsink and fan isn't powerful enough. Text is not being displayed properly, either with pixel crawl or the entirely wrong letter displaying, as seen below. Also, when …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-11-01, 23:49

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is the Text and PCX files for the DX2-66V16BGC and the DX4-100NV8T Also attached is the picture of the CHKCPU test for the DX2-66V16BGC.

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-11-01, 23:37

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My wife said to go ahead and test it since I can find another one on ebay. I went ahead and did the speedsys test, and I ran CHKCPU. I checked, doubled checked and triple checked my jumpers and they match what the jumper manual says, but it still detects the DX2-66 as a DX4-100. I even checked with …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-11-01, 20:28

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here we go. Your DX2-66 behaves like a DX4 and you may try the jumper settings for DX4. Reason: AM486DX2-66 V16BGC is a downlabelled Enhanced AMD 486 DX4 Your DX4-100 behaves like a DX2 and you may try the jumper settings for DX2. Reason: AM486DX4-100NV8T is basically a 3.3V DX2 with the core from …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-11-01, 13:43

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I cannot bench the 486DX2-66 as I cannot get it to run as a DX2-66. I tried all different jumper settings from the three different boards which are supposed to have the same jumper settings and all of them identify the DX2-66 as a DX4-100. But the two chips are as follows - AM486DX2-66 V16BGC and …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-10-31, 14:28

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay I have gotten some of the parts in. I took out the 15ns cache and replaced it with 256K of 12ns cache. I also got in the 16MB kit of EDO but I haven't installed it yet. I made a few more changes in the BIOS to match what I have seen online for other machines that appear to be similar to my …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-10-27, 03:34

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Your L2 cache cannot be enabled without a tag chip. I hope you get more than 8 cache chips. The board already has a tag chip installed. I know it's different than the cache chips that I bought, but I thought it would work in a pinch. I also got 15 chips. They are supposed to be NOS. I will know …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-10-26, 04:48

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay, so since I had such a limited supply of 72 pin RAM, I went ahead and ordered some more online. I got a couple sets of 2x8MB EDO 72 Pin sticks. They should be here by the end of the week. I also managed to snag some 32Kx8 at 12ns Cache chips. Hopefully they will work fine in the board. No tag …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-10-25, 06:05

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I searched through various other sticks of RAM that I have. Sadly I have only 1 stick that is labelled as EDO and it's only 4MB. I checked my stash and I had a single 8MB stick, and two 4MB sticks, but one of them was FPM and the other was EDO. Then the 16MB stick. Is interleave something that is …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-10-24, 23:48

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

retardware wrote on 2021-10-24, 22:34: I don't recommend using noname RAMs. What I recommend is using interleave, with two or 4 banks. Does the Hyundai stick work if you pull out the noname stick? The Hyundai stick has been tested. It does not work. I get a repeating low tone on a cyclical pattern …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-10-24, 21:07

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Happy Weekend everyone. I hope you are all doing well. I am trying to tighten timings to squeeze more performance out of the 100MHz DX4 before trying to find something like a AMD 5x86-133 chip. My biggest bottleneck seems to be memory. I moved the Awe64 Value card to a different slot on the ISA bus …

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-10-02, 21:30

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay, I sent a PM with the files. Thank you.

---

Re: Trying to set up my first DX4-100 ever and encountering strangness?

Posted on 2021-10-02, 15:26

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sure you can, use this program : http://cd.textfiles.com/microhaus/mhblackbox3/MEMORY/GETROM.ZIP Okay. It took me some time to get back to this but I have made a rom file from this BIOS now, I think? I followed the instructions and I have three files. An ATROM, TEMPODD and TEMPEVN. Which ones do …

---

Re: hole plating lifted on old IPC-T card on 10V 100uf cap on negative lead.

Posted on 2021-10-01, 15:01

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This is what I see when I use a soldering iron that is too weak and needs time to heat up. This Kgert soldering thing has very thin pens, it looks to me like a 5-10W soldering iron suitable/intended for very fine stuff only, way too small for general purpose electronics works. A good soldering iron …

---

Re: HardMPU, anyone?

Posted on 2021-09-28, 14:55

by

by nathanieltolbert

in Marvin \ Sound

in Marvin \ Sound

Okay further testing has been done. I have checked the same machines now with my MPU-IPC-T card and it works in all of my 486 machines, but I cannot get my HardMPU cards to work. I have tested all of the HardMPU cards that I put together and they work in every Pentium or higher machine that I have, …

---

Re: hole plating lifted on old IPC-T card on 10V 100uf cap on negative lead.

Posted on 2021-09-28, 14:46

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay. I raised my temp on my cheap little KSGER T12 solder pen and checked the board. There was a solder pad for the negative leg on top of the board, so I tried to carefully solder to that pad. The solder held, and made what appears to be a decent connection. I tested the board and it's working now …

---

Re: hole plating lifted on old IPC-T card on 10V 100uf cap on negative lead.

Posted on 2021-09-22, 01:16

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have leaded solder. I am using a cheapie KSGER T12 Solder station. 180C does melt my leaded solder, but very slowly. When working with non-leaded solder I usually have it set to 240C. Those are too low? I sadly don't have any classroom experience with solder as my education never called for it. …

---

Re: hole plating lifted on old IPC-T card on 10V 100uf cap on negative lead.

Posted on 2021-09-22, 00:36

by

by nathanieltolbert

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wow, that card you have there looks different from mine entirely. I did the best I could, as I have put away my solder tools, and couldn't remove the cap I put in. I know it's blurry, but I cannot really tell if there is a solder point on the top. Here's a cropped shot of the area.

---