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Re: External battery header for 286 getting charging voltage?

Posted on 2023-02-12, 23:42

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You're right, as a layman I wrote "current" when I should have written "voltage." Now that I know to test it, I am reading 0 uA of current. In fact, with a 100 ohm resistor in place of the battery, I'm reading 0 volts on the battery header, so it seems like I'm safe to install the battery and see if …

External battery header for 286 getting charging voltage?

Posted on 2023-02-12, 00:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, I recently removed the leaking Varta battery from my 286 and am trying to connect an external 3.6v lithium battery to it with a battery holder wired up to the external header. It looked like there was charging current going to the positive terminal, so I added a 1N4002 diode in line with the …

Re: Identify motherboard thread

Posted on 2023-02-08, 03:14

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

After testing voltages on the battery header and changing the jumpers I suspected, it seems you may be correct in the case of this board, but it would still be nice to be able to find some documentation about it. Not to get too off topic here, but if I'm seeing a voltage increase in sort of a …

Re: Identify motherboard thread

Posted on 2023-02-07, 06:07

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I need some help figuring out what this 286 motherboard is. It's almost identical to the Biostar MB-1212V except for some components on the edge near the ISA slots. Maybe it's just an earlier revision. Does anyone know what the logo on the serial number sticker is? I actually found one on eBay but …

Re: Trouble using XTIDE with 486

Posted on 2020-03-08, 00:07

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The machine I have is an OPTi 495SLC. It's pretty hard to find any documentation on it. The video card ROM shows up in System Information as a ROM BIOS extension. I'm guessing that might not be considered an option ROM. I flashed the ROM with a TOP ROM burner. It's pretty reliable. I couldn't flash …

Re: Trouble using XTIDE with 486

Posted on 2020-03-07, 17:38

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the reply. The problem with this computer is that it doesn't seem to see the option ROM at all. The only one that appears in the system is the ROM for the video card.

Trouble using XTIDE with 486

Posted on 2020-03-07, 06:42

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi everyone, I'm trying to get XTIDE running on my 486 and having no luck getting the ROM to work. I just assembled a Lo-tech ISA ROM board (the board with just the EEPROM on it) because my previous attempts to use a NIC had failed. However, no matter what address I set the card to, it never boots …

Re: Ontrack 9.57 on CF card - can't view on modern PC

Posted on 2018-01-27, 18:14

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for all the replies! I'll give EZ-Drive a try for now. I am still curious how Phil was able to open his CF card on a new machine after installing Ontrack from a 386. I do want to switch to XT-IDE. I have a ROM burner so I just need to find an appropriate ISA card to use the ROM with.

Ontrack 9.57 on CF card - can't view on modern PC

Posted on 2018-01-27, 07:07

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi everyone, I am trying to use Ontrack 9.57 to utilize my entire 16GB CF card in my 486. It works fine on the machine, but when I put the card in my Windows 10 PC it tells me the card has an unrecognized file system and I need to format it. What is the secret to being able to just pop the card into …

Re: Upgrading Opti 495SLC

Posted on 2018-01-14, 19:35

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So, I have my network card installed, but I get messages saying the network has responded incorrectly or that the lobe test failed. I'm assuming it doesn't know how to talk to my router, but none of the speed options, etc. seem to be doing any good. As for drives, I have a VLB IDE card on the way …

Re: Upgrading Opti 495SLC

Posted on 2018-01-12, 03:48

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That's definitely something to look into. For ethernet, is it harder than having Windows install the drivers and connecting it to a router? I put an ethernet card in this machine with exactly that intention but I haven't done anything with it yet.

Re: Upgrading Opti 495SLC

Posted on 2018-01-12, 00:47

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I should also say that I only have a 16GB card because that's the smallest I could find locally. It is indeed limited to 2GB partitions. I'm less concerned for the moment with the size of the partitions and more with the ability to copy files using a CF card reader while using more than 504MB of the …

Re: Upgrading Opti 495SLC

Posted on 2018-01-11, 05:05

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I just found that I had a copy of Conner Disk Manager (a version of the OnTrack DDO) that can detect all 16GB of my CF card, but it was only able to create 2 2GB partitions which are only readable on the 486. Judging from Phil's video about OnTrack, maybe later versions don't have that issue or …

Re: Upgrading Opti 495SLC

Posted on 2018-01-07, 20:19

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I actually have a VLB Diamond Speedstar Pro in it right now and it works quite nicely. Speaking of VLB cards, if I get an EIDE interface card, can I overcome the 504MB drive limit? How would I find out for this board?

Re: Upgrading Opti 495SLC

Posted on 2018-01-07, 19:49

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think I found it! It's "unidentified" according to this site. http://stason.org/TULARC/pc/motherboards/U/UN … -BUS-3-486.html The amount of slots is correct and the jumper numbers all seem to correspond...

Re: Upgrading Opti 495SLC

Posted on 2018-01-07, 04:56

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks. I found those PCX files as well. That board is nearly the same as mine except the jumpers are all in different places. I didn't want to take the board completely out of the case unless I need to, so let me know if seeing the other part is of any use.

Upgrading Opti 495SLC

Posted on 2018-01-06, 21:34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, I'm trying to locate the proper jumper settings for my particular motherboard revision and having a heck of a time. It's an Opti 495SLC 3/486 board marked Rev. B and none of the documentation I can find online has the jumpers in the right place to match my board. The BIOS string is 40-040B- …

Re: AMI 286 BIOS dead?

Posted on 2016-06-13, 03:16

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I took the hard drive out and it still didn't POST. I then decided to try to back up the HD to my CF card I have in my 486. After a long string of playing with hard drive settings, it corrupted the HD in my 486 and now that drive reports the wrong size in DOS and I can't seem to format it back to …

Re: AMI 286 BIOS dead?

Posted on 2016-06-12, 20:34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think the battery is dead actually. I will try taking it out since I need to remove it anyway.

AMI 286 BIOS dead?

Posted on 2016-06-12, 17:00

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I just rebuilt my old 286 which had been in pieces for several years. It needed a new video card and I now had one so I reassembled it and it booted fine. I got an error message about C: having an error, so I assumed I didn't have it set up correctly in BIOS. After a few tries, I got what I assume …

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