Re: The World's Fastest 486

Posted on 2019-12-26, 13:07

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does the MediaGX have a larger cache line size to go along with the 64-bit memory bus or does it maintain a 16-byte line size and shorten the burst length to 2x 64-bit words? Maybe that explains the lackluster memory performance of the MediaGX (that, and the bandwidth-stealing video)

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Re: old x86 memory performance flaw+benchmarks

Posted on 2019-12-23, 12:08

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The main link sounded a bit like snake oil, but after checking out the technical page I decided to experiment on my 83MHz Pentium Overdrive. Reading the first dword of the next line before reading the remaining dwords of the current line does result in higher throughput compared to REP LODSD. 74,000 …

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Re: Overclocking the Cyrix/IBM 6x86MX PR200

Posted on 2019-12-21, 23:35

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I would think that if you can put a socket A cooler or a big socket 370 cooler on there it should be enough to offer peace of mind regarding CPU temperature. In terms of wattage the Cyrix chips would never come close to a 60W+ Athlon, even with a small bump in the voltage. But maybe one of those …

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Re: What retro activity did you get up to today?

Posted on 2019-12-20, 19:59

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Went to turn on my 286 and was greeted with silence. Looks like a PSU replacement in the future 🤦 Also tried to harvest IDE connectors from a scrap motherboard using a hot air blower from a plastic welding kit. Result is a bit messy but probably salvagable.

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Re: What retro activity did you get up to today?

Posted on 2019-12-18, 11:47

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Opened up a Sony CDU33A. The power/activity LEDs came loose somehow. Possibly other problems... large pics of the PCB: http://www.hyakushiki.net/misc/cdu33a-t.jpg http://www.hyakushiki.net/misc/cdu33a-b.jpg

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Re: 430TX (and other chipsets) and 75MHz (and 83MHz) FSB

Posted on 2019-12-17, 06:22

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well.. Are you sure the option to lock it actually works? Because the page I linked above says only VPX and VPX/97 can run 75MHz and only at 1/2 divider or Asynch (whatever that implies?) Well, it's not like I checked it with a scope at the PCI slot, but changing the jumper between 33MHz or FSB/2 …

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Re: using external monitor on iMac?

Posted on 2019-12-17, 06:14

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by bakemono

in Marvin \ Video

in Marvin \ Video

The LCD is "busted" as in physically, it has a large crack and impact damage on it.

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Re: Fix aspect ratio on Nvidia drivers.

Posted on 2019-12-17, 06:12

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by bakemono

in Marvin \ Video

in Marvin \ Video

Try using the monitor's OSD to see what resolution it is detecting. That should tell you whether it is the monitor or the video card that is rescaling. My bet is that the 780ti is doing the rescaling from 640x480 to the monitor's native resolution and that's why the aspect ratio is incorrect. …

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Re: How many Amps does a 486 PC use on +12V?

Posted on 2019-12-16, 14:29

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Would all together reach 18A? On the 12V rail? I doubt it would even reach one third of that.

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Re: 430TX (and other chipsets) and 75MHz (and 83MHz) FSB

Posted on 2019-12-16, 14:25

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

nearly no Socket 7 Chipsets that have a 2/5 PCI divider. Actually, nothing aside from Aladdin IV seems to have a divider for Socket 7 PCChips M537 (the one with VIA VP) can set the PCI to 33MHz when using 75/83MHz bus. CPU is an mII-PR266GP (2x75MHz) Surely it's a 2.5x multiplier? 37MHz PCI is …

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using external monitor on iMac?

Posted on 2019-12-16, 03:31

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by bakemono

in Marvin \ Video

in Marvin \ Video

I know very little about Apple stuff in general, and I received an 800MHz iMac with a busted screen. Small areas of the screen are still visible so I can tell that it boots up, but when I plug in an SVGA monitor using an adaptor for the proprietary Apple VGA port there is no signal. I was wondering …

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Re: [Windows 2000] CompactFlash instead HDD ISSUES

Posted on 2019-12-16, 03:05

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by bakemono

in Marvin \ Software

in Marvin \ Software

there is an alternate driver called cfadisk that you can install which should make the device detect as non-removable I'm not sure if it actually works in Win2000 though, the description only says XP. Before trying it, you should have a plan to revert the change if it doesn't work and causes a no- …

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Re: What retro activity did you get up to today?

Posted on 2019-12-13, 11:58

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Decided to revisit my attempt at mixing ADPCM on the X68000. I hadn't noticed before that the description on page 303 of Inside X68000 is copypasta from a YM2608 datasheet and is NOT the actual format used by the MSM6258. It says on the previous page that the real format is 不明 (not clear) LOL. The …

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Re: BALE Signal on IDE Channel? PIN 28

Posted on 2019-12-11, 21:52

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

On the ISA slot BALE is supposed to signal when the address becomes valid. On the IDE port it seems redundant since every I/O cycle will involve an IOR or IOW command and the address is certain to be valid already when that happens anyway. But if you are testing with a scope it looks like BALE …

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Re: What retro activity did you get up to today?

Posted on 2019-12-10, 21:21

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This might sound funny but a while ago I was playing Hyper Dimension Neptunia rebirth 3 on Windows 2000, only to give up because it was crashing every time when Plutia first transforms. The commonly stated fix for this on 32-bit Windows is to boot with the /3GB switch as I mentioned in this thread …

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Re: Any recommended AGP GPU card for 300w psu?

Posted on 2019-12-10, 20:10

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PSU is probably fine unless you have several harddisks in there or something. The real question is what you are running on a P3 for which a Radeon 9600 isn't good enough. But if you can find a GeForce 7600 AGP that would be much faster in theory (totally limited by the CPU most likely) and doesn't …

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Re: This file builds a 32Bit MS-DOS

Posted on 2019-12-10, 00:06

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by bakemono

in Marvin \ Software

in Marvin \ Software

Interesting. The unstated part of this is that after copying a few Windows files (win9x? win95 only?) to the 32bd directory, you then can go in there and run "WIN" but because krnl386 has been replaced by command.com it dumps you at a V86 mode command prompt without fully booting. Tried it on my 486 …

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Re: can I install a Pentium 200 in socket5?

Posted on 2019-12-09, 22:39

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If the board doesn't have 2.5x and 3.0x multiplier settings, you can always mod the CPU to get them. Other than that, a Pentium 200 should work the same as a Pentium 133.

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Re: Period appropriate CRT monitors?

Posted on 2019-12-09, 22:17

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by bakemono

in Marvin \ Video

in Marvin \ Video

My Chuntex VL700 monitor was made in 1997. It is specced for 69KHz hsync, which includes 1024x768x85Hz or 1280x1024x60Hz. I was able to push it to 1280x960x70Hz with nVidia drivers. 1152x864 was good too. This is on a screen with 16" viewable area.

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Re: What retro activity did you get up to today?

Posted on 2019-12-06, 02:50

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by bakemono

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I was reading up on the W5100 ethernet chip, with an aim toward interfacing this with some retro hardware (obviously not PCs which can use normal ISA/PCI cards). ebay has a large number of pre-built PCBs with this chip, BUT they are all designed for arduinos and only have the SPI interface connected …

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