Re: Retro PCs, internet connection sharing, safety

Posted on 2024-01-30, 22:00

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I could always get a second internet line, but the price is not worth it for how often I would use it just for retro machines. I think it’s an overkill. Using VLANs would be more than enough. Actually, you just could get a cheap router and make a nested NATed LAN inside your NATed LAN and that will …

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Re: Additional RAM needed for my 486

Posted on 2024-01-30, 09:12

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

According to the table, you can combine any modules of different supported sizes in any order. Your module is FPM (chips partname ends with zero: 4400)

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Re: Retro PCs, internet connection sharing, safety

Posted on 2024-01-30, 08:53

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

WIndows ICS is literally a macro, which enables the built-in routing services in Windows, so it becomes a network router, providing network address translation for network connected to a secondary LAN port. The level of vulnerability depends much on how the WIndows machine itself is connected to the …

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Re: EDO RAM compatibility

Posted on 2024-01-29, 21:15

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Trying to figure out this early-RAM module chaos in my head, as I understand not all 72-pin modules are EDO, and EDO means there are no wait states, therefore I'd assume that EDO RAM needs support from the motherboard, but does EDO RAM work on non-EDO motherboard? The jump from 72-pin SIMMS to DIMM …

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Re: ECS AC486 PGA: searching for a BIOS dump

Posted on 2024-01-27, 19:27

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I use this list https://mrbios.com/techsupport/award/postcodes.htm Just try this link: https://github.com/cirosantilli/ralf-brown-interrupt-list/blob/master/inter61d/PORTS.A At line 7837 you’ll find the list which is not provided in the document which you have referenced. I’ve traced down the …

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Re: ECS AC486 PGA: searching for a BIOS dump

Posted on 2024-01-27, 13:31

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Reporting progress so far: 1. I have spent several hours analyzing assembly code with IDA Pro, which is a separate torture because of so-called ROM calls (A method of calling functions without using any RAM: xxxx:xxxx mov sp, return_addr_ptr // jmp function_addr), which prevents the whole engine …

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Re: ECS AC486 PGA: searching for a BIOS dump

Posted on 2024-01-23, 14:16

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

this looks like a good candidate https://theretroweb.com/motherboards/s/juko-at046dx3#bios ACC Micro 2168 with "30-0004-428002-00101111-070791-ACC2046-0" bios string I've tried this BIOS, and it starts, loads the VGA BIOS, starts to count RAM, finishes with that correctly, shows the "Wait..." …

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Re: ECS AC486 PGA: searching for a BIOS dump

Posted on 2024-01-21, 19:11

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

ebay seller claimed thats what ecs-ac486 was reporting. At this point its the only clue as to ecs-ac486 bios string on the whole internet. That string leads to https://theretroweb.com/motherboards/s/unknown-acc2046 seemingly the only motherboard ever with ACC2046 chipset. Most likely ACC2186 is …

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Re: ECS AC486 PGA: searching for a BIOS dump

Posted on 2024-01-21, 18:56

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I done even know how is this supposed to work. You need special IRQ arbitration (IOAPIC) for multi CPU systems. https://en.wikipedia.org/wiki/Advanced_Programmable_Interrupt_Controller https://wiki.osdev.org/IOAPIC The only way this board could operate is as normal single CPU board with slave …

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ECS AC486 PGA: searching for a BIOS dump

Posted on 2024-01-21, 18:07

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi! I've got a relatively rare 2-CPU motherboard According to the RetroWeb it's ECS AC486 PGA. The drawing matches. It has some moderate residues from damping in water and appears repairable to me. The problem is that somebody pulled off the BIOS chip from it! IMG_8884.jpg All I know is that it has …

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Re: PCChips M396F instable start

Posted on 2023-11-16, 23:24

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am just saying.... check evrything , my Toshiba(IBM spec) would simply "not compute" above a _ without a 3.6v li-tion charging batt inserted... (it's a 286). Before salvageing for parts and recaping , try a hot air reflow of evrything.(after cleaning - if not functioning properly). A 5 min burst …

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Re: PCChips M396F instable start

Posted on 2023-11-14, 16:47

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does that happen when you have a battery in it? (did you properly clean the board? alcohol or contact/brake/multipurpuse cleaner ?) did you check with a magnifiyng glass for cracked solder spots/joints? Although I’m not so bad at cleaning leakage, broken tracks, etc and have a whole barrel of …

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Re: PCChips M396F instable start

Posted on 2023-11-14, 15:20

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does that happen when you have a battery in it? (did you properly clean the board? alcohol or contact/brake/multipurpuse cleaner ?) did you check with a magnifiyng glass for cracked solder spots/joints? Although I’m not so bad at cleaning leakage, broken tracks, etc and have a whole barrel of …

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PCChips M396F instable start

Posted on 2023-11-14, 14:00

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi to everyone. I have one PCChips M396F V2.7 motherboard, based on SARC RC2016A5 chipset for 386SX. The battery is removed. I test it as well as my other MBs on an open stand without enclosure if that counts. Being otherwise clean It has one annoying malfunction: Rarely it may coldstart normally …

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Re: Zoltrix Audio Plus 3200 / Analog Devices AC305 missed parts

Posted on 2023-10-26, 09:38

by

by rpocc

in Marvin \ Sound

in Marvin \ Sound

Apparently it's a usual TO92 voltage regulator: 78L05, feeding +5V to AD1848KP or whatever chip. After installing missing OpAmp and 78L05 I've got it back to live and it plays tunes but to me it looks far from ideal since the regulator heats to the point nearly too hot to touch, so it appears to be …

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Zoltrix Audio Plus 3200 / Analog Devices AV305 missed parts

Posted on 2023-10-25, 15:15

by

by rpocc

in Marvin \ Sound

in Marvin \ Sound

Hi to all. Need a little help from an owner of the subject. Is there any owner of this sound card? It's known under few different names but two most known are listed in the subject. 20230117_183418_.jpg I have one of those with traces of very bad repair and missing U2 IC and a missed FET transistor, …

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Forensic test for a Socket 3 CPU using a multimeter

Posted on 2023-09-22, 12:34

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've got something interesting for you. Currently I've collected about dozen of different Socket 3 CPUs. Also, I recently purchased an IBM PC 330-6571, PC 350-6581 motherboard from dumpster, exactly like pictured here: https://theretroweb.com/motherboards/s/ibm-pc-330-6571,-pc-350-6581 It has a CPU …

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Re: An obscure 72-pin SIMM

Posted on 2023-09-18, 20:12

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

i'm 95% confident it is for the IBM series. probably only for the 90, 95, or pc server 500 models. Did you want to let them go? ^.^ Currently I just have to decide what to do next with them. Having no access to these specific machines I can't find out if modules are actually working so couldn't …

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Re: An obscure 72-pin SIMM

Posted on 2023-09-18, 15:31

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

well, its entirely possible its for the IBM series. it seems you are handy with a multi meter. I would ring out the SPD pins at the far end of the simm. if it matches with the table at the bottom of this site: https://www.ardent-tool.com/memory/Reference.html then its a very good chance its for IBM …

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An obscure 72-pin SIMM

Posted on 2023-09-16, 20:18

by

by rpocc

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have acquired a handful of SIMM modules which couldn’t be detected by my motherboards. Actually I didn’t tried all of my boards but at least no luck with 82c471-based 486 MB and one very typical Triton-based Pentium MB. These modules look like the one attached. 94EBDBBF-BCAE-4586-B4F1-2831DF945715 …

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