Information wanted for UMC UM8881F sub-revisions

Posted on 2022-05-24, 09:53

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does anyone have detailed information on the UMC UM8881F Northbridge chip sub-revisions? It appears that not all UM8881F chips support the same features. The identifier following the datecode appears to be a sub-revision. About 12 years ago I hard ordered some spare UM8881F chips and specified a …

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Re: 3 (+3 more) retro battle stations

Posted on 2022-05-20, 07:25

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

@Feipoa I see the same visual glitches on the other two VIP UM8881 motherboards when using GD-54## graphics cards. Tried on SiS VIP and VLB boards - no problems. Looks like specific Quake + UMC + GD-54## issue. Not just GD-54**. It also happens with my Mach64. I bet it will happen with your Trio64 …

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Re: The World's Fastest 486

Posted on 2022-05-19, 20:45

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

CPUGalaxy's 486 Quake record has been beaten for some time now by users pshipkov and Chadti99. I think they are at 22.6 - 22.8 fps. The custom any clock device is interesting. I'd personally like to see a plug-in replacement for DIP-14 PLL's found on many of the socket 3 PCI systems, e.g. UM9515-01. …

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Re: 3 (+3 more) retro battle stations

Posted on 2022-05-19, 04:03

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

It is certainly reassuring to know that my M919's are equally as flakey as yours concerning the 64 MB perf. sinkhole and Quake visual glitches. Thanks a lot for testing this. I wonder if it has to do with how the VLB is implemented on the UM8881. Were there any other [non-PC Chips] UM8881/8886 …

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Re: 3 (+3 more) retro battle stations

Posted on 2022-05-18, 11:31

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

Better yet, if you are able to run WinQuake from Win95, the frequency of the corruption is much greater. Make sure you are running it with sound. The corruption occurs not only with a Trio64V+ VLB, GD-5428 VLB, Mach64 VLB, but also the Virge VLB. I swapped the sound card from the S23A to an …

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Re: Market value for popular or rare classic computer hardware

Posted on 2022-05-18, 11:27

by

by feipoa

in Milliways

in Milliways

Acer Magic S23A sold March 2022 $130 USD $130? Wow! Are these cards any good? I pulled one out of a PC Chips system recently but figured it was junk. The S23A comes with these sound chips: CX4237B CS9233-CX CS4112-CS The regular Acer Magic S23 (no A suffix) also contains the CX423X, but instead of …

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Re: 3 (+3 more) retro battle stations

Posted on 2022-05-18, 07:11

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

You were planning on using the GD-5428 VLB for the Quake w/audio tests. Are you still able to test this card? There is no issue with PCI cards and the issue with the Trio64V+ is much less prevalent than with the VLB versions of the Mach64 or 5428. What FSB are you running? I don't understand how you …

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Re: VGA adapter to convert a graphics card interlaced mode to non-interlaced mode on LCD?

Posted on 2022-05-17, 06:01

by

by feipoa

in Marvin \ Video

in Marvin \ Video

That sounds a lot more reasonable.

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Re: 3 (+3 more) retro battle stations

Posted on 2022-05-16, 22:55

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

I'm having all kinds of consistency issues with my M919's. I'm having trouble getting the w95 Virge VL drivers working again. How did the 5428 w/sound card and Quake go? For my case, I needed to stare closely at the Quake timedemo the whole time without blinking much. I see red turn to green, and …

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Re: VGA adapter to convert a graphics card interlaced mode to non-interlaced mode on LCD?

Posted on 2022-05-16, 22:44

by

by feipoa

in Marvin \ Video

in Marvin \ Video

I am not in any rush. If someone chimes in within the next 10 years who shows a working example of the test criteria, I would be grateful. I live in Canada; if you are able to find one of these shipped to Canada for under $50, please relay the source. A $49.95 part on USA eBay routinely ends up …

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Re: 3 (+3 more) retro battle stations

Posted on 2022-05-16, 06:28

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

I've been testing with these VLB cards: Trio64V+, Mach64, GD-5428, and Virge. I'm using an Acer Magic S23A ISA sound card and have noticed that in DOS Quake or WIN Quake, if I have sound enabled, I will see occasional colour goofs during the timedemo (w/Trio64V+). Those colour goofs become a lot …

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Re: VGA adapter to convert a graphics card interlaced mode to non-interlaced mode on LCD?

Posted on 2022-05-16, 03:42

by

by feipoa

in Marvin \ Video

in Marvin \ Video

darry, unless I missed or misunderstood something presented already, I haven't seen any test results for the resolutions of interest. Many people have a GD-542x VLB graphics card, so perhaps some results will turn up. Ideally, I'm hoping to see a Windows 9x desktop display 1024x768x16 on the 5428, …

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Re: VGA adapter to convert a graphics card interlaced mode to non-interlaced mode on LCD?

Posted on 2022-05-16, 02:36

by

by feipoa

in Marvin \ Video

in Marvin \ Video

darry, unless I missed or misunderstood something presented already, I haven't seen any test results for the resolutions of interest. Many people have a GD-542x VLB graphics card, so perhaps some results will turn up. Ideally, I'm hoping to see a Windows 9x desktop display 1024x768x16 on the 5428, …

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Re: VGA adapter to convert a graphics card interlaced mode to non-interlaced mode on LCD?

Posted on 2022-05-16, 02:18

by

by feipoa

in Marvin \ Video

in Marvin \ Video

If anyone else has one of these Extron or similar scaling units and also posses graphics cards which output interlaced mode at 1024x768 or 1280x1024 at 43 Hz, I'd be interested to see your results on an LCD. If I recall, the Microlabs ET4000W32i (Ultimate TrueColor XL) and the Cirrus Logic GD-5428 …

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Re: 3 (+3 more) retro battle stations

Posted on 2022-05-15, 22:56

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

I've been playing around with the m919 v3.4 and a Cyrix 5x86-120 w/1024K and VLB graphics. Seems like PCI graphics are a bit more stable. Have you run any comparison here? Also, did you test 1024K w/128 MB for stability?

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Re: Market value for popular or rare classic computer hardware

Posted on 2022-05-13, 09:54

by

by feipoa

in Milliways

in Milliways

Something else interesting: the box says it is to upgrade 386SX and 386DX systems, however the CPU employed on the upgrade, the 486SXLC, is 16-bit only. So I guess you'd see a sizeable performance hit if you were to upgrade your 386DX?

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Re: Market value for popular or rare classic computer hardware

Posted on 2022-05-13, 05:30

by

by feipoa

in Milliways

in Milliways

New, open box Improve Technologies Make-It 486 Upgrade for 386SX 16-40 MHz systems Sold for $259USD https://www.ebay.com/itm/185416191042 I thought it would sell for more. I guess now that COVID restrictions are lifting/lifted, the price of this old junk is falling? Improve_Technologies_Make-It_ …

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Re: S3 ViRGE VLB project (or " Making a Concurrent for Creative 3D Blaster VLB" )

Posted on 2022-05-09, 19:00

by

by feipoa

in Marvin \ Video

in Marvin \ Video

That's not a big problem for me. I'm hoping he will release some alpha NT 3.51/4.0 drivers.

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Re: The World's Fastest 486

Posted on 2022-05-09, 03:23

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Don't forget that the LSD doesn't work with the on-board floppy controller at 66 MHz. Perhaps this can be circumvented by using an I/O card or LS-120. One of the issues i've run into with LS-120 drives is that once the DOS driver is loaded, the LS-120 drive doesn't always work correctly once booted …

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Re: Market value for popular or rare classic computer hardware

Posted on 2022-05-08, 04:16

by

by feipoa

in Milliways

in Milliways

QUANTUM 3D Obsidian 2 X-24 SLI2 3Dfx Voodoo 2 SLI https://www.ebay.com/itm/275296657446 Sold for: 1,102.00 USD. Seems like a lot of money to save one PCI slot.

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