Re: Intel 486DX4 vs Cyrix 5x86 showdown (at high FSB frequency)

Posted on 2024-05-15, 17:55

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I found the AMD X5 133 to be almost exactly the same performance as the 586-100. At 120MHz the Cyrix jumps ahead in most areas. This matches my experience. AMD 5x86 at quadruple clock has a similar overall performance to a Cyrix 5x86 (with branch prediction enabled) at triple clock. So parity is …

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Re: [SOLVED] What does "IOCHREADY" mean and what is its purpose?

Posted on 2024-05-13, 05:31

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does all that mean that it's better the "I/O channel ready" signal to be available i.e. the "IOCHREADY" jumper on the ISA I/O+ATA controller to be shorted/closed? On ISA controllers, it's usually not needed. The standard ISA wait states are slow enough that the transfer works without using …

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Re: nec d481850gf replacement

Posted on 2024-05-12, 19:51

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

so the uPD481850 will fit in place of d481850gf and do the same job? The chip labelled NEC D481850GF is the NEC µPD481850GF. "GF" denotes the package PQFP100, which is the only package the NEC µPD481850 has been mass produced. So if you order a NEC µPD481850, you will surely receive a µPD481850GF, …

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Re: [SOLVED] What does "IOCHREADY" mean and what is its purpose?

Posted on 2024-05-12, 19:31

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

One of the two jumper pins (I soldered them some time ago, just to make it look "complete") is directly connected to ISA slot A-10 pin (I/O CH RDY) and the second pin goes directly to ATA pin-header on pin 27 (IOCHRDY), so no controller logic is involved in this signal. An ISA IDE "controller" is …

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Re: Need help finding isa riser for 286

Posted on 2024-05-10, 19:15

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello everyone, I'm having trouble finding an isa riser for my old 286. It's a philips pcd 200, I remember there was a isa riser with 2 slots, but probably it wasn't a standard card. Anyone know if there is a riser for this type of slots? Thanks! I've come across multiple copies of a riser card …

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Re: How to set Single mode DMA on ESS ES1868 drivers in Windows NT 3.51?

Posted on 2024-05-09, 12:01

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

feipoa wrote on 2024-05-09, 07:39: Someone came forward with a fixed ESS driver to enable single-mode DMA in NT 3.51 and NT4. See Re: Windows 95 VMCPD.VXD blue screen freeze on boot when FPU installed. Any ideas?

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Re: Windows 95 VMCPD.VXD blue screen freeze on boot when FPU installed. Any ideas?

Posted on 2024-05-09, 12:00

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you know anyone who can modify the Windows NT 3.51 drivers to have a single-mode DMA option, or even have single-mode DMA hard coded, please let me know. As it stands, this system only works well in Windows 3.11. It can work in Win95 w/out NPU, or within NT 3.51 / 4.0, but without sound, …

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Re: Intel 486DX4 vs Cyrix 5x86 showdown (at high FSB frequency)

Posted on 2024-05-08, 21:14

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There has been a lot of research into the design and sizing of cache memory over many decades, and unless the implementation is completely and utterly broken (which is always possible) or an exploit results in the performance increase being negated by security measures (e.g. cache flushing on …

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Re: Alone in the Dark + AWE32 CT2760 - doesn't detect SB Pro, plus game patches for sound/music

Posted on 2024-05-08, 17:39

by

by mkarcher

in DOS

in DOS

I am posting this in this subforum as while it involves a sound card, it is for a game issue. I installed Alone in the Dark on my K6-III+ with my AWE32. When running the configuration, I cannot select Sound Blaster Pro. This was also happening with the card on a Socket 7/Pentium 166 MMX system. The …

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Re: How to set Single mode DMA on ESS ES1868 drivers in Windows NT 3.51?

Posted on 2024-05-06, 06:24

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

I'm not sure what else to test to demonstrate the increased efficiency of demand mode DMA. Nonetheless, this test demonstrates the issue is with the Symphony 461/362 /465 chipset in combination with the ES1868 sound card. As the increased efficiency mainly targets ISA bus usage, try something else …

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Re: How to set Single mode DMA on ESS ES1868 drivers in Windows NT 3.51?

Posted on 2024-05-06, 01:17

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

I hear the same white noise on the other Symphony based 461 board (all other hardware the same). I just checked photos of the DTK PEM-4030Y and noticed that it doesn't have a 82c206 IRQ/DMA/Timer controller chip, but that functionality is included in one of the three big Symphony chips, the 461, …

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Re: Windows 95 VMCPD.VXD blue screen freeze on boot when FPU installed. Any ideas?

Posted on 2024-05-05, 23:21

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Illegal operation: Explorer executed an invalid instruction in module SHLWAPI.DLL. I suspect this may be related to the lack of the 486 instruction set in the Am386DX. There's a good chance that Win95b/c makes use of 486 instructions. I receive the same error with or without an FPU installed when …

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Re: How to set Single mode DMA on ESS ES1868 drivers in Windows NT 3.51?

Posted on 2024-05-05, 23:04

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

Also, I'm using an AHA-1522B SCSI controller, which uses PIO for tranfers, but still has a DMA channel setting, which I set to 6. In fact, that controller can use DMA, both 8-bit DMA and 16-bit DMA (you can set it to DMA0). On the other hand, ISA DMA causes a lot of trouble (extra virtualization …

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Re: List of VLB IDE Controllers

Posted on 2024-05-05, 15:43

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thank you very much for your reply. I got the ide 2 working with xt-ide. I guess you need the XT-IDE Universal BIOS (XUB) because the IDE port you use is still responding to the secondary port address (170) and uses the secondary interrupt line (IRQ15). If you want to get rid of that, you would …

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Re: How to set Single mode DMA on ESS ES1868 drivers in Windows NT 3.51?

Posted on 2024-05-05, 11:01

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

Is there any performance benefit in using single-mode DMA vs., presumably, multi-mode DMA? There is a performance draw-back in using single-mode DMA. The full name would be "single-cycle mode DMA". Single Mode DMA is the simplest mode of DMA, and using it for high-bandwidth applications is not …

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Re: Can an online library of classic video games ever be legal?

Posted on 2024-05-05, 10:27

by

by mkarcher

in Milliways

in Milliways

Hi, I'm no lawyer, but I think there be could be exceptions. For example, if the platform has a couple of physical copies (originals) of a game in their HQ. Then, users could play those copies online. Again, it's just an idea, a concept. Laws around the world are all different, also. You are not …

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Re: Help disassembling Win 3.x executable (NE)?

Posted on 2024-05-05, 10:20

by

by mkarcher

in Marvin \ Software

in Marvin \ Software

Yes, I'm asking to disassemble NE files, which are Win 3.x executables... IIRC we had a thread some months ago about different freeware IDA versions, and until which version some 16-bit loaders are included in the IDA freeware version. A key point of IDA is that NE support is not required once you …

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Re: 386 dram 0 wait state causes no boot, cache related?

Posted on 2024-05-05, 10:14

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I still have the 64k chips, i could try to put that back in and see if 0ws is stable with that. Also looks like the last post in that old thread said M5M5188BP was a compatible chip, but i don't see any on ebay currently in -15ns Any 16K x 4 fast CMOS SRAM chip in DIP22 should be compatible. This …

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Re: Secret of Monkey Island. AWE32 troubles with music

Posted on 2024-05-05, 09:18

by

by mkarcher

in DOS

in DOS

So I really an wondering what disabling PIII L1 cache is supposed to do, to assist my sound card's MT32 emulation. That's indeed surprising behaviour. I don't see a way L1 cache (even if you might have DMA coherency issues, which by itself is extremely uncommon except in mis-jumpered 486 systems) …

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Re: List of VLB IDE Controllers

Posted on 2024-05-05, 09:10

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have this card. https://theretroweb.com/expansioncards/s/kentech-computer-hk-ltd-evlsio-v2-003-pdc20 Does the ide interface only work through vlb slot? Or is there a way to get it working in isa mode? This card is a "special" card in this regard. It has two IDE connectors, called IDE0 and IDE1. …

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