Re: GA-586DX USB pinout scheme

Posted on 2023-09-10, 18:50

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That´s probably the case! A lot of more modern PCI cards don´t work or don´t work properly on this board. This BIOS supports SMP and everything, maybe they snatched some tables and data to make it fit. As long as this issue isn´t sorted you don´t have to bother about the continuity of the data …

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Re: GA-586DX USB pinout scheme

Posted on 2023-09-10, 18:41

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What I meant was if +5v supply and ground are confirmed and the BIOS supports and enables USB and USB still does not work it´s useful to check if the datalines are connected to the south bridge. Therefore you neet to set your multimeter to "resistance" or "ohms" (2K range). Then you start with pin …

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Re: GA-586DX USB pinout scheme

Posted on 2023-09-10, 14:43

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

SU903 supports USB. Sometimes there are additional components on the mainboard in the signal lines like resistors (about 22R) and capacitors that might be missing when the USB header was not populated. You can check each of the 4 lines for continuity (Ohmmeter) to make sure all lines are connected …

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Re: Ha-586DX USB pinout scheme

Posted on 2023-09-10, 11:34

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

First make sure the revision of the southbridge (SB82371SB) supports USB. It´s the characters above the "INTEL Ⓜ ©" line, right of the large "i" logo. Then you need to do sme measuring: 1. Which of the pins of the USB headers are "ground"? 2. Which of the pins of the USB headers are "+5V"? 3. Are …

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Re: M919 cache max safe voltage

Posted on 2023-09-09, 16:24

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The Toshiba chip is rated for 3.0 - 3.6V, so overvolting it by 20% would mean operation out of specs. I guess it´s similar for the Samsung chips. If you can replace any defective chips yourself - just run it with 4V, if you want to keep this rare cache stick original, try to run your cpu stable at …

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Re: M919 cache max safe voltage

Posted on 2023-09-09, 15:38

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The two transistors of the VRM circuit are working parallel for the same CPU core-voltage. This voltage is also feeding the "COAST slot". If you set the VRM to 4V, the cache chips will operate with 4V also.

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Re: Resurrecting a Lanner AP-40AHD board PC

Posted on 2023-09-07, 19:08

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

DerBaum wrote on 2023-09-07, 18:49: Wow. that thing looks... really old 😁 256k memory? For editing BIOS setup it´s good to go. And AFAIR most 8-bit VGA cards are indeed quite old.

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Re: Resurrecting a Lanner AP-40AHD board PC

Posted on 2023-09-07, 18:37

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If "DerBaum" finds the correct jumpering for 8-bit operation of the Trident, you can still resale or return the 8-bit VGA...

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Re: Resurrecting a Lanner AP-40AHD board PC

Posted on 2023-09-07, 18:31

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think the chances might be good, there are some jumpers for 16/8 bit BIOS etc, some marks are under a sticker. It´s probably safer not to trust "auto detect".

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Re: Resurrecting a Lanner AP-40AHD board PC

Posted on 2023-09-07, 18:11

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Your SBC is 16-bit, so it will work wiith your 16-bit VGA on a 16-bit ISA backplane. Filename ISA8_16.JPG File size 39.76 KiB Views 178 views

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Re: Resurrecting a Lanner AP-40AHD board PC

Posted on 2023-09-07, 17:45

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You could buy a 16-bit ISA backplane instead, but this will not come any cheaper, I´m afraid.

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Re: Resurrecting a Lanner AP-40AHD board PC

Posted on 2023-09-07, 16:28

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is the ISA slot you put the VGA card in 8-bit or 16-bit? If it´s 8-bit (only the longer part of the slot being present) chances are your VGA card won´t work. There are only a few ISA VGA cards that support both ISA versions. You would need something like this in this case: https://www.ebay.com/itm/ …

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Re: Acorp 5ALI6, super socket 7 board, have a question

Posted on 2023-09-05, 18:49

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

"G" northbridge has it´s own TAG RAM - functional and active, if there was no external TAG chip present. Adding one will, in the best case, have no effect at all.

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Re: Acorp 5ALI6, super socket 7 board, have a question

Posted on 2023-09-05, 07:48

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What´s written on the ALi M1542 chip at the end of the line above "TAIWAN" (last character)?

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Re: Acorp 5ALI6, super socket 7 board, have a question

Posted on 2023-09-05, 07:38

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What revision does the ALi northbridge have? Depending on this an external TAG-cache chip is needed or not. Revision "E" (and lower) need an external TAG chip, "G" anh "H" have a functional integrated TAG and don´t need an ext. one, not sure about "F" at the moment...

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Re: ISA Intel 80286 Single Board Coputer MBVLSI-168 (UG-286V)

Posted on 2023-09-04, 06:45

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Traces with an "open end" are often grounded and have some shielding function to prevent signals from interfering with each other. Otherwise I could think of a sloppy rearrangement between different revisions of this SBS, but that wouldn´t be Taiwan-like...

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Re: Gigabyte GA-6BA motherboard not good for voodoo3

Posted on 2023-09-03, 05:29

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Gigabyte engineers had a clouding of their minds. Two voltage sources are not connected in parallel, only current sources are connected in parallel. :-( For normal operation, it is necessary to remove the linear regulator (remove it completely) and direct apply a voltage of 3.3V from the ATX …

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Re: Parity Errors On A 286 Unitron U3911-V3 Mainboard

Posted on 2023-09-03, 05:12

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I also have this Toptek VLSI mainboard (it was the one I borrowed the chips from). I tested it with both SIPP sticks and DIL chips (4MB) and it worked perfectly. I guess you have checked all the solderings of the PLCC84 chips carefully / resoldered them all? My FTK VLSI board wouldn´t start …

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Re: Parity Errors On A 286 Unitron U3911-V3 Mainboard

Posted on 2023-09-02, 20:26

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Right - it should always be enabled. It was established for a reason despite the high additional memory costs.

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Re: Parity Errors On A 286 Unitron U3911-V3 Mainboard

Posted on 2023-09-02, 20:16

by

by majestyk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There´s basically no need anymore to disable parity. With jumper 11 in position 1-2 the "CAS signal delay" (or whatever) seems to fit the current RAM type and RAM configuration, the systim is running 100% stable and without any errors despite being slightly overclocked. If this delay time is set …

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