Re: Rendition Verite Thread

Posted on 2024-05-28, 06:40

by

by analog_programmer

in Marvin \ Video

in Marvin \ Video

Is there a way to flash a modified bios with higher CPU frequency? Just a suggestion: if there is an original BIOS dump file from V2100 card (for example Diamond Stealth II) and a BIOS file for upgrading the very same V2100 card to V2200, maybe it would be possible to find out which bytes are …

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Re: Socket 7 build freeze at splash screen.

Posted on 2024-05-18, 05:12

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you're trying to use some non-PCChips ATX form card, check the pinout for the connector here: http://m571.com/m571/franczabkar/ps2mouse.htm - this one is for PCChips M571 non-LMR, but must be the same as the one in the M571LMR. The board also has dedicated PS/2 mouse connector near the keyboard …

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Re: Socket 7 build freeze at splash screen.

Posted on 2024-05-17, 18:49

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

These PCChips M571(LMR) motherboards use SiS5598 chipset (renamed to something like "TX Pro II") and according to this link: https://www.anandtech.com/show/72/14 the maximum cached RAM is 128 MB which is better than Intel's 430TX chipset cached RAM limit of only 64 MB. I think, such a chipset cache …

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Re: Socket 7 build freeze at splash screen.

Posted on 2024-05-17, 06:47

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have M571 v.3.2A (Elpina branded) which is similar board and it is very picky about installed RAM modules. At least it works well with modified BIOS for AMD K6-III+/2+ with 83 MHz FSB.

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Re: Which BIOS EPROM for Pentium II board?

Posted on 2024-05-16, 05:58

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

naujoks wrote on 2024-05-16, 05:49: I have another Slot 1 mobo, which has a MX28F2000P EPROM IC. Could that work here? Probably it may work, but note that MX28F2000P erasing and programming voltage is 12 V.

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

Posted on 2024-05-15, 21:01

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

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 lower maximum temperature than the ADZ, so you might even get that processor to 160MHz given sufficient peltier cooling. Yeah, …

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

Posted on 2024-05-15, 18:14

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

mkarcher wrote on 2024-05-15, 17:55: ... and furthermore nearly every AMD 5x86-133 overclocks without any issues to 160... Does this include the Am5x86-133 ADW?

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Re: Help identifying dead unknown 386DX motherboard with Mr. BIOS

Posted on 2024-05-15, 07:29

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

No way I can fix those lines, just too small for my eyes and equipment... :( In this particular case, If you can't solder some very thin wires to restore the broken traces, it is useless to try to tin the traces inflicting more damage to the motherboard. Just hand the board to someone with proper …

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Re: 386 Board RAM type

Posted on 2024-05-15, 06:44

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It looks like this one: https://theretroweb.com/motherboards/s/armas-mst-1267-a But there's no manual uploaded on TRW site, so use the picture from the first post in the thread (jumper settings at the bottom):

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

Posted on 2024-05-13, 07:28

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've just checked my other old VLB I/O+ATA controller for 486 systems and it also has separate "IOCHRDY" jumpers (factory populated) for both the ATA channels, but it also has jumpers for setting the PIO modes - 0 to 3. It was factory set to PIO mode 0 and I/O ch. ready - disabled, now I fixed this …

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

Posted on 2024-05-13, 05:44

by

by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Aha, this makes sense. And it's actually backwards of what I thought according to vstrakh 's explanations. Right now I'm using 250 MB HDD attached to this ISA controller and this hard drive supports PIO mode 3 . When I find some time, I'll test drive's transfer speed with and without IOCHREADY …

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Re: What do you use your ramdisk/ramdrive for?

Posted on 2024-05-13, 05:14

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Back in the 80386/80486 days my home computer had only 4MB of RAM (the RAM modules pretty expensive back then), so other than a one-time test, I've never used DOS RAM-drives. Later hard drives got bigger and fast enough (and win 95 came) that I forgot that there was such a DOS tool. Nowadays old FP …

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

Posted on 2024-05-13, 04:33

by

by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks everyone for sharing details about the ATA interface that I never bothered to know. Correct, the IDE ribbon cable is basically just extending the ISA bus to the hard drive. The actual controller is the PCB on the bottom of the drive. IDE means integrated drive electronics. (for ISA …

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

Posted on 2024-05-12, 19:02

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I traced back this "IOCHREADY" signal on the controller's PCB. 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 …

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

Posted on 2024-05-11, 08:14

by

by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This line is driven by the devices, the chipset will be listening it to give devices more time. It's not that it is required. It's not really needed at all unless you're running some really slow device (ISA card or ancient IDE drive) on a faster ISA bus and it's glitching at those speeds. …

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

Posted on 2024-05-11, 08:10

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by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, so this is probably more of a CPU/chipset/ISA bus related setting. But still, in which case I may need it? Slower CPU, slower ISA bus setting, slower HDD?

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

Posted on 2024-05-11, 07:54

by

by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Input Output Control Hub or the South Bridge in most cases controls access to all IO systems on the Motherboard from Serial through to Drives, pretty sure USB along with all other Input/Output systems are part of the south bridge in newer modern systems. In older boards USB/Firewire is controlled …

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

Posted on 2024-05-11, 07:22

by

by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm using some ISA I/O+ATA controller in my old 386SX system and on its settings jumper are missing two pins corresponding to "IOCHREADY (Optional)". What does this IOCHREADY mean and what is the purpose of this setting? All mechanical hard drives I have ever used with this I/O+ATA controller have …

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In search for CHGDMI.EXE and MODEL.DMI for IBM Aptiva 2139

Posted on 2024-05-11, 07:06

by

by analog_programmer

in Marvin \ Software

in Marvin \ Software

Hi, retro computers fellas! I flashed the BIOS of IBM Aptiva 2139 motherboard (V66XA) with Acer's BIOS because of newer CPU support and now I reverted back to it's original IBM's BIOS, and of course serial number in BIOS now is 00000000. Before I flashed the Acer's BIOS I wrote down the original …

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Re: M912 with 1 MB cache

Posted on 2024-05-10, 09:43

by

by analog_programmer

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It was set to 512KB because the 1MB wasn't working right. It is labelled as 1.4 I have determined that the second bank just isn't working at all. I am going to sell this as a working 512KB board and get something with 1MB Ahhh, now I see. I'm sorry, I just tried to help by what I saw on the picture …

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