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Re: Intel DX4-100 write-back (&EW) won't post Edit: Probably a fake chip

Posted on 2020-07-30, 23:37

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

eBay seller responded: "First, we build circuit boards for a third party and we purchased several hundred of of these DX4 processors. We completed the project and had 127 left over still in the shrink wrapped package.. All of the board delivered to the third party worked and were satisfactory. We …

Windows 2000 hangs on "please wait" screen

Posted on 2020-07-30, 19:32

in Marvin \ Software

in Marvin \ Software

I'm installing Win2000 SP4 on my 486 system (DX4-100, 80 MB ram, Opti 802C, 4 GB Quantum Fireball) and it gets stuck on the GUI "please wait" screen. Shift+F10 opens the command prompt, so the computer isn't frozen. Does this part just take a really long time? How can I tell what's causing it to …

Re: How does the Pentium Overdrive 83 work?

Posted on 2020-07-30, 19:20

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok thanks, I didn't realize it was a unique chip design, thought it may have been a standard Pentium core with some kind of socket/voltage adapter.

How does the Pentium Overdrive 83 work?

Posted on 2020-07-29, 19:51

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is the chip actually modified to allow it to work in a Socket 3 system, or is there some kind of interposer/adapter that lets it work? If it's an interposer, then couldn't there be a generic Socket 4/5 to Socket 3 adapter?

Mixing parity with non-parity memory

Posted on 2020-07-29, 19:49

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can it be done? I don't have any special settings in the BIOS or anything. 72-pin FPM simms in a Socket 3 system.

Re: Intel DX4-100 write-back (&EW) won't post

Posted on 2020-07-25, 03:40

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just tried it at 3.9V @ 66 MHz, no post. Also tried 50 MHz. Edit: messaged the seller mentioning the chip is either defective or fake. Let's see if he responds.

Re: Intel DX4-100 write-back (&EW) won't post

Posted on 2020-07-25, 03:08

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I did notice the die looks too big. Seems odd there would be a market for fakes??? I'm curious what it actually is. I'm tempted to turn it up to 5V and see if it's a phony DX2 or something, of course that would fry it if it's a legit chip.

Intel DX4-100 write-back (&EW) won't post Edit: Probably a fake chip

Posted on 2020-07-25, 01:21

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just got a NOS DX4-100 chip but can't get it to post. Anything odd about it or did I just get a bad chip? Tried 3.0V-3.5V, nothing. System boots right up with the old DX4-100 &E chip. System a IBM Valuepoint 466DX2/Dp. Do some systems not work with the write-back cache (&EW)?

Reducing overhead of Win98 when running DOS games

Posted on 2020-07-22, 17:32

in Marvin \ Software

in Marvin \ Software

I'm having some trouble getting a specific game to work in DOS mode (command prompt only) in Win 98, but it works when run from Windows directly. However it takes a big performance hit from doing this. (The game runs intermittently from DOS, I haven't figured out why, but the frame rate is …

Re: More 486 L2 cache troubles - timing sometimes so slow that cache isn't worth it?

Posted on 2020-07-21, 21:14

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Those of you with 486DX2/66 or 486DX2/80 and 256KB cache - what are your cachechk timings? This isn't exactly what you asked, but it might provide a point of reference at least - 486DX4/100 w/ 50 MHz FSB and 256KB cache (20ns): 10 us/KB for 1-8K 11 us/KB for 16K 22 us/KB for 32-256K 33 us/KB for > …

Re: Windows 98SE Update Recommendations

Posted on 2020-07-20, 19:39

in Marvin \ Software

in Marvin \ Software

The most modern browser that I have found that is Windows 98 compatible is Opera 10. Unfortunately, even Opera 10 does not support modern security protocol (TLS 1.2), and therefore it appears any secured websites do not work.

Whiplash / Fatal Racing working in Windows 98, but intermittently when running from DOS prompt

Posted on 2020-07-20, 19:37

in Marvin \ Software

in Marvin \ Software

When double clicking on the executable from Windows 98SE, the game runs consistently, but with significantly lower performance than when restarting to MS-DOS and running the game that way. However, the game often will not start when running from the DOS prompt. It often hangs at a blank screen, but …

Re: Is this a decent PSU?

Posted on 2020-07-20, 16:23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Recently purchased an AT case to start building my DOS build. Case came with a Star 230W Switching power supply. I can’t find much information on this PSU. Here are a few pictures. No transient voltage suppression. No line filter. Schottky diodes in a barrel package using the inadequate heatsink as …

Re: Whiplash / Fatal Racing on Voodoo graphics

Posted on 2020-07-20, 05:48

in Marvin \ Software

in Marvin \ Software

Still working on this. Thanks for the patch -- I assume this would only be for the software renderer (not 3dfx)? Seems like the game works consistently when I run it from Windows. Often it will not load when I restart to command prompt. What gives? The game runs much better when rebooting into DOS …

Re: Quick Questions on Packard Bell PB450 3.3v mod

Posted on 2020-07-20, 05:15

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

CPU might be dead, but I just went through the same thing and used a generic VRM on Amazon. It was cheaper (and considerably easier) than trying to make my own. https://smile.amazon.com/gp/product/B07CVBG8C … 0?ie=UTF8&psc=1

Re: Resurrecting an old IBM Valuepoint 486 machine. How can I get it to contribute to World Community Grid?

Posted on 2020-07-19, 23:43

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't think this is going to work (stating the obvious??) Looks like Win98 can no longer communicate on the internet using any modern security protocol. I got the client to connect, but it won't transmit anything. Same problem using even the latest browsers that could run on Win98 (Opera 10 seems …

Re: Multiplier control for 486

Posted on 2020-07-19, 18:20

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the info! So it sounds like if I used a Am586 @ 50 Mhz FSB it would use a 3x multiplier, which is what I wanted. This is the motherboard, it's not a standard board (IBM system).

Multiplier control for 486

Posted on 2020-07-19, 01:54

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

How is the multiplier set on DX4's and Am5x86's? My system does the following DX4-100 @ 33 MHz FSB = 100 MHz (3x) DX4-100 @ 40 MHz FSB = 80 MHz (2x) DX4-100 @ 50 MHz FSB = 100 MHz (2x) I thought the processor had a default multiplier? Somehow my chipset is overriding it? What would happen if I tried …

Re: 486 voltage converters

Posted on 2020-07-17, 17:02

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

According to Speedsys my DX4-100 is equivalent to a 586-133. Not sure how 'pure cpu' the test is, this is with a 50 MHz FSB and write-through cache. EDIT: My system got a CPU score of 39.45 with 33 MHz FSB (and slow AF cache/memory timings), so it's not a pure CPU test.

Re: 486 voltage converters

Posted on 2020-07-17, 15:48

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Do you know what the pinout is for the voltage regulator socket? I recently went thru this and using a multimeter and probing the pins (and a few bits of imcomplete information from the web, and a little leap of faith) I figured out how to wire up a generic VRM from Amazon. The generic VRMs are …

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