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Re: When did you purchase your first 386 / 486 Computer? Availability vs the early 90's affordability norm.

Posted on 2020-12-31, 16:55

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here a brief history of PCs that I owned. I worked in a lot of academic computer labs up to 1994, so I had PCs with lan/darpa access for many hours a day up to 1994 even if I didn't own one. 1982 - C64 - $600 1983- 1541 Floppy Drive - $250 1990 - 16mhz 386sx, 2MB Ram , 3.5" Floppy, 512KB WD Paradise …

Re: Problems with my Commodore 486SX-25

Posted on 2020-12-30, 19:23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you check the voltages coming out of your power supply? Do any of the capacitors on the motherboard look puffy? Is there an L2 cache you can disable via jumper?

Re: Rarest CPUs?

Posted on 2020-12-30, 14:58

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

OMG! I think my fake drinking ID in the 1980's might have been better quality than that chip.

Re: Ali M1209 Chipset and 4MB Simms

Posted on 2020-12-30, 00:07

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here's one that says 32MB -- But I don't have enough documentation to figure out if that's EMS only. https://arvutimuuseum.ee/th99/i/I-L/50517.htm

Re: Ali M1209 Chipset and 4MB Simms

Posted on 2020-12-29, 23:48

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here's one that take 4MB simms: https://arvutimuuseum.ee/th99/i/A-B/52462.htm I imagine if there was a board that switched between EMS and XMS, maybe you would put more than 16MB on it, but I never saw such a thing.

Re: Ali M1209 Chipset and 4MB Simms

Posted on 2020-12-29, 21:14

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've got a few 30 pin SIMMs. If they fail CheckIt! out to the trash they go.... Nice collection, and I wanted to look at the simms, but like the camera, all I could do was focus on the sock!! I prefer memtest+ to CheckIt, but yeah, I agree, bad ram has to go and I tossed the bad simm in the trash …

Re: Ali M1209 Chipset and 4MB Simms

Posted on 2020-12-29, 19:13

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I still remember the time where the whole world seemed swamped in 30-pin 1MB SIMMs no one needed anymore, so it's a strange feeling for me to see these modules today at prices that are way above shipping costs. One should be able to catch some cheap modules with a bit of patience, even the (likely …

Re: Ali M1209 Chipset and 4MB Simms

Posted on 2020-12-29, 17:52

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the help. ISA Ram? Wow. Interesting idea. Didn't think about that. I'd worry that the ISA ram is likely not L2 cacheable, except this this little board doesn't even had an L2 cache, so no worries, right? As much fun as it would be to try to get this little fellow running with something …

Re: Ali M1209 Chipset and 4MB Simms

Posted on 2020-12-29, 04:56

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Caluser2000 wrote on 2020-12-29, 04:38: You'll need 4 or 8 of 30 pin simma. Most likely the mobo bios/chipset only sees/supports 16megs all up. It’s a 386sx so it only has a 16 bit memory bus, which is why it works with 2 simms.

Ali M1209 Chipset and 4MB Simms

Posted on 2020-12-29, 04:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have a cheap old Ali M1209 chipset 386sx motherboard. http://www.win3x.org/uh19/motherboard/show/6283 I want to run windows 95 on the board just for fun. I have 7 good 9-chip 1 MB simms (+1 bad one). The board works reliably with 2x or 4x 9-chip simms. Only detects 1 MB of ram when I try 6 simms …

Re: Am386DX/DXL not posting

Posted on 2020-12-28, 20:03

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Do you have the memory in the correct sockets? I have a DX DXL 40 motherboard and I have to populate the 4 outside sockets first or I just get the blinking cursor. What's the best way to loosen that hot glue where the battery used to be? Isopropyl? I have the same lump on my board.

Re: IDE CF Adapters Question

Posted on 2020-12-28, 03:56

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think it is possible to use Ontrack disk overlay without using the Non-dos partiotion type. Ontrack 9.57 on CF card - can't view on modern PC https://www.philscomputerlab.com/ontrack-disk-manager.html

Re: VLB OD6500A Multi IO IDE Controller Card Bios Chip

Posted on 2020-12-24, 15:36

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That looks like a UMC UM82C480 chipset -- http://www.win3x.org/uh19/motherboard/show/1263 There's a decent chance that the MR-BIOS from this board will work-- http://www.win3x.org/uh19/motherboard/show/5409 In order to backup or program bios for a motherboard that age, you usually need a burner . I …

Re: Repair Old Opti bus motherboard - G486PLB-3

Posted on 2020-12-23, 15:20

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I got the driver disk!!! Photo Dec 23, 10 04 29 AM.jpg This is probably a 1.2Mb disk and my 5.25 drives are not good . I have a 360K drive that won't read this disk and a 1.2MB that now spins & seeks after a bunch of cleaning, but always reports "track 0 bad disk" when I try to format a blank disk. …

Re: Overclocking the AT bus on a 386/40 motherboard

Posted on 2020-12-22, 17:04

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does the IDE interface go faster when you over clock the bus? Yes, see my first post in this thread. The results from Coretest 3.03 are for IDE disk transfer rates. I see that the IDE transfers are faster. Love it. I wasn't clear enough when I asked my question. I was wondering if you increased the …

Re: VLB OD6500A Multi IO IDE Controller Card Bios Chip

Posted on 2020-12-22, 16:58

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What motherboard are you using? Maybe I can help you find a rom image.

Re: mistakenly bought Adaptec AHA-1510A SCSI adapter (version with no BIOS), would it still work on a 286?

Posted on 2020-12-22, 15:06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is it feasible to add a Bios to the card?

Re: Repairing 386 MB, Need ideas...

Posted on 2020-12-21, 00:22

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you put the eprom in reader to see if it still opereates?

Re: PCI Video card works in one PC, not in another

Posted on 2020-12-20, 22:30

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

More research and I found a Full Yes 430TX board (2A59IF3BC-00) that is baby AT and has 3.3v going to the PCI. It has AT and ATX power connectors, but curiously, the PCI 3.3v doesn't come from the ATX power supply, it comes from the socket 7 voltage regulator. Lol!

Re: Adding 3.3V regulator to a cost reduced 486 motherboard

Posted on 2020-12-20, 20:17

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The boards with a single regulator have some PCB differences. Looks like I'm going to have to learn more about circuits before I do this.

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