Re: Old hardware giveaway thread.

Posted on 2025-03-22, 18:15

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

giving away for a shipping price. preference towards take-it-all offer. Fully working MiniATX PSU from Synology NAS. Quadro 2 Pro L800 in the upper right corner broke. Needs a replacement. This should fix the card. Been sitting in the "fix me" stash forever. I dont have the motivation. Jaton VLB VGA …

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Re: Wow ISA BUS insanely overclocked and running DOOM at 35 FPS with an ISA ATI Mach32

Posted on 2025-03-22, 00:50

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

DEATs numbers confirm once more that ISA bus is the main perf limit. Thanks for sharing. Good stuff. If i understood correctly, you are testing with Am5x86 at 150MHz (3x50), correct? If so, then your results are significantly better than where the youtuber was in his video. In fact, these are …

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Re: Fastest storage solution for (ISA only) systems

Posted on 2025-03-22, 00:41

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My understanding is that ISA IDE controllers implement PIO-0 mode. Never saw one that offers an adjustable PIO cycle time. Even if such thing existed it will be capped by the ISA bus, especially when operated within the standard 8-12MHz. So, the answer to your second question is - potentially yes, …

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Re: Wow ISA BUS insanely overclocked and running DOOM at 35 FPS with an ISA ATI Mach32

Posted on 2025-03-18, 06:50

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Mike, pass a visual reference for your board. I remember you mention it in the SXL2 interposer thread but still don't know which one it is. Or if you posted somewhere in the thread there i either didn't see or forgot about it. I have almost 0 experience with 386SX stuff, other than 2-3 boards like …

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Re: Wow ISA BUS insanely overclocked and running DOOM at 35 FPS with an ISA ATI Mach32

Posted on 2025-03-18, 06:39

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

These concepts are well understood at a basic, surface level - the way we casually talk about them here. It's actually a much more complex topic for folks developing products that are impacted by these factors. I actually had bunch of signal processing classes in university but never got to practice …

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Re: 286 upgrade: Evergreen 486 SuperChip version D3 Rev.B, FPU not working

Posted on 2025-03-17, 06:38

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Jp1 on the motherboard controls sync/async fpu. Either the 1993 of the module is damaged in some way, something you mentioned in DM that you cannot test easily because you dont have other 286 mobos readily available for that, or there is some specific incompatibility between exactly this mobo and …

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Re: Wow ISA BUS insanely overclocked and running DOOM at 35 FPS with an ISA ATI Mach32

Posted on 2025-03-17, 04:33

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, captured another video - this time 200MHz CPU (3 x 66), 33.33MHz ISA, same video card CL GD-5434. For completeness. Doom reaches 46.5 fps. Not bad at all. A bit more display degradation. I am not doing great job at properly showcasing this. May replace the videos later if find the motivation to …

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Re: Wow ISA BUS insanely overclocked and running DOOM at 35 FPS with an ISA ATI Mach32

Posted on 2025-03-17, 00:21

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Many ISA video cards can handle just fine 25MHz and higher frequencies. Especially true for later model ISA cards based on VLB class video chips. These chips are designed to operate at 40MHz and higher. Some of them can do 60 and 66 MHz. So, nothing unusual really. For example, here is a quick run …

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Re: 3 (+3 more) retro battle stations

Posted on 2025-02-23, 02:02

by

by pshipkov

in Marvin \ System Specs

in Marvin \ System Specs

My AL486V-D board is NOS so very hesitant to mess with it. Btw, this post of mine reminded me that once i had a very similar board, which led to the recognition that Xinetron X/LAN Xi-210-B is relabled USA integrations SC-9204-A. From there i found few more motherboards of the same base design in …

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Re: 3 (+3 more) retro battle stations

Posted on 2025-02-21, 02:09

by

by pshipkov

in Marvin \ System Specs

in Marvin \ System Specs

yes, cross checked all possible combinations, including AMD 386DX-40 cpu running at 33 and 40 mhz, with and without fpu, with and without l2 cache, many different jumper and bios configs.

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Re: 3 (+3 more) retro battle stations

Posted on 2025-02-20, 20:47

by

by pshipkov

in Marvin \ System Specs

in Marvin \ System Specs

@H3nrik V! JP13 - Probably but didn't check. JP20 - yes, U42 - fixed it above. Yes - the U42 component is a PLACE16V8H . Didn't check if the jumpers are connected in any way to the PAL, but simply switching them around results in no functional/perf difference. @Feipoa Actually, i had quite good time …

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Re: 3 (+3 more) retro battle stations

Posted on 2025-02-20, 08:27

by

by pshipkov

in Marvin \ System Specs

in Marvin \ System Specs

Xinetron X/LAN Xi-386/486-SC rev.A based on Xinetron X/LAN Xi-210-B also known as USA SC-9204-A A riddle of motherboard. https://www.petershipkov.com/temp/retro_pc_images/components_lo/motherboard_386_xinetron_x_lan_xi-386_486_sc_rev_a.jpg A powerful looking 386/486 hybrid assembly: - plenty of CPU …

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Re: Sound card detectives welcome. Blurry photo of DCS Vibra16 with wavetable??

Posted on 2025-02-12, 07:27

by

by pshipkov

in Marvin \ Sound

in Marvin \ Sound

Found it right away. It was the first returned result by google for “acer isa sound card”. Sponsored! Filename IMG_0104.jpeg File size 467.98 KiB Views 478 views File license Public domain

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Re: Market value for popular or rare classic computer hardware

Posted on 2025-01-25, 21:59

by

by pshipkov

in Milliways

in Milliways

Cyrix DRx2-33/66 with factory heatsink sold for $302. https://www.ebay.com/itm/256747720909 Are prices inching down? Cyrix_DRx2-66_with-factory_heatsink.png On the other hand, was watching a USB to SCSI adaptor listing which sold for $150, yet there are several of these on eBay. They are simply not …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2025-01-13, 16:35

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, OUT to OUT. Fixed in my previous reply. No SXLC2-66 here. Only 50MHz rated ones. It will take time to determine if the different hardware configurations make any difference. The current setup vs buck only and the interposer stripped vs presence or absence of caps on the interposer. Not sure i …

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Re: Clueless question about VR...

Posted on 2025-01-13, 15:39

by

by pshipkov

in Milliways

in Milliways

What you ask is to mirror your main or another screen to the headset. This is easy. HTC Vive can do it. Apple Vision Pro can do it. I assume any other headset can do it. However, if you try to play games, especially first person point of view ones, or full screen sliding/moving, it will mess up your …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2025-01-13, 01:17

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did further testing with DTK PEM-4036Y. Anticipated improved stability compared to DTK PEM-0030Y but that was not the case. Along the way i noticed something interesting - PEM-0030Y seems to be the better motherboard for SXL2 chips compared to 4036Y/YB. At 40MHz FSB and up 0030Y can handle TIMING …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2025-01-13, 00:46

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes. Buck OUT to LDO IN OUT. Other MIO pin to PSU GND. This was the least intrusive way i could think of. Do you see a problem with it? Yes, i remember long ago checking the performance progression in DOS real mode between 286, 386DX, and 486DX processors. L1/L2 caches disabled for 386 and 486. …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2025-01-12, 19:57

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

feipoa wrote on 2025-01-12, 03:07: I noticed that you still have the MIC linear regulator installed on the interposer in your previous photo, yet are using the buck on the fan's 5V header. I assume you are merely cutting the MIC's enable lead to disable it? This is what i got for one of the …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2025-01-12, 19:54

by

by pshipkov

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Buck/Linear regulators: The response characteristics of the Buck Regulator are far better than Linear, as they can respond to voltage dips depending on switching speed. If this is working better than Linear Regulators, it shows a lack a capacitance absorbing the dips..? DX4-ODP/R, and POD linear …

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