Re: Schneider Euro PC

Posted on Today, 18:23

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think the problem with monochrome is that my machine outputs 49Hz signal in text mode, and my philips pro 7BM743 cannot sync to that signal. It syncs to 50Hz signal in hercules games though. Hmm, that's interesting. An original MDA card uses a 16.257MHz crystal, whereas the Hercules Card, and …

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Re: Terratec Gold 16/96 no sound on lineout, only on speaker

Posted on Today, 14:47

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

As the cable I used was obviously working in the plug, I used it to connect to a mobile speaker. And yes, it worked. The headphone plug is slightly shorter... it works in the other plug though... If I am correctly suspecting that the resistors R32/R33 are on the way from the line-level signal on …

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Re: Terratec Gold 16/96 no sound on lineout, only on speaker

Posted on Today, 11:37

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

I have a TT Gold 16/96 which is working normally, as far as I can tell. Except for one problem: I don't get any sound on the line out plug. None. Most sound cards are designed in a way that the line out signal is used as input for the speaker/headphone amplifier. So getting a good speaker signal …

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Re: Smoke coming from PAS16

Posted on Today, 11:28

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

Going to have a look at the crystal pins to make sure I haven’t shorted any of them. Be aware that the pinout you show is for the TQFP version of that chip, but you installed the PLCC version of that chip on your sound card. Installing the PLCC version was the correct thing to do, because the card …

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Re: 486, IO-controller and VLB Vesa Local Bus

Posted on Today, 07:12

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

With the maestro 32/96, I had success. The drive was recognized, but then I got a command.com failure message before the boot completed. It must have been able to read from the IO controller with CF first, as MSDOS started and loaded the CD driver. Then it looked a bit as if control had passed to …

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

Posted on Yesterday, 13:38

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've seen a drive with broken IOCHREADY output that pulls the line constantly low, and thus halts the ISA bus completely as soon as it is connected. Is this why most computers lock up tight when you plug the IDE cable in backwards? That might be one contribution, but it most likely is not the only …

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Re: Is it possible to copy the Warcraft 2 CD?

Posted on Yesterday, 13:08

by

by mkarcher

in DOS

in DOS

Game doesn't care about the audio tracks or even the disc label. That doesn't completely match my experience: Maybe it indeed doesn't care about the audio tracks on the CD, but I know for sure that some version of WarCraft 2 at least cares about the MSCDEX passthough API (which is used to send …

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Re: 486, IO-controller and VLB Vesa Local Bus

Posted on Yesterday, 12:58

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have been eyeing VLB IO-controllers with two IDE connectors. I can't remember what will happen in bios? Does it show 4 drives then? Does it not work? How do I get to set the secondary IDE geometry for CF cards? Your BIOS most likely only supports a single (the primary) IDE channel. There are some …

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Re: Help needed: identify an ISA sound card

Posted on 2024-05-15, 19:59

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This thread has all information about the sound card that can be known without having the hardware at hand to perform experiments. "GS" might be "gameport select" and in that case will enable/disable the integrated game port. It definitely is not related to the Roland GS MIDI Standard. The card …

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

Posted on 2024-05-15, 19:42

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

... and furthermore nearly every AMD 5x86-133 overclocks without any issues to 160... Does this include the Am5x86-133 AD W ? It seems the chance to get to 160 is lower on the ADW: https://www.vogons.org/viewtopic.php?p=370188#p370188 On the other hand, the ADW is just specified to have a 30°C …

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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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