this post was submitted on 01 Sep 2024

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Legend 730 Update (lemmy.world)

submitted 2 weeks ago by [email protected] to c/[email protected]

19 comments fedilink hide all child comments

A few days ago I posted about my old PC and there was some interest, here's an update.

tldr: the hdd saved everything! It has windows 3.1 and all the games I remember are still there.

Longer story: I bought a few adapters for PATA/IDE to USB and they didn't work. I had this weird issue where when I plugged the usb into my computer, the drive would power off. You can hear it spinning when it's on, plug in USB, drive powers off. Unplug USB, drive powers back on. So after buying 2 different adapters, I gave up on trying to read it that way.

Then, I got a floppy reader and a bunch of floppy disks. The software testdisk has a DOS version, so I copied that to a floppy and ran it on the computer. While it was analyzing the HDD it told me in an error message that the drive appeared smaller than it actually is, and I should update my bios settings.

After struggling to figure out how to get to bios (ctrl alt s, AFTER BOOTING), I googled my drive model and found the cylinders, heads, sectors information and manually typed that into the BIOS as a "user defined" hard drive, and that was all it needed to be able to read the drive.

After that it booted straight into PC DOS + Windows 3.1 and everything is there. I found recipes, games, and other programs.

I was going to try to send files over serial, but it wasn't working for me (i still haven't tried zmodem yet) but I couldn't even receive an echo to the serial port. So I've been backing things up by copying to floppy disk, then reading the disk on my laptop with a reader.

Image of hard drive

Image of the computer running kings quest

Running testdisk

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[–] [email protected] 13 points 2 weeks ago (2 children)

I bought a few adapters for PATA/IDE to USB and they didn't work. I had this weird issue where when I plugged the usb into my computer, the drive would power off. You can hear it spinning when it's on, plug in USB, drive powers off. Unplug USB, drive powers back on. So after buying 2 different adapters, I gave up on trying to read it that way.

This sounds like the PSU doesn't have enough watts to go around when you're plugging in a USB device that draws power. You might be able to get USB devices to work if you use a powered USB hub.

[–] [email protected] 7 points 2 weeks ago* (last edited 2 weeks ago)

No, the reason it doesn't work is that IDE to USB adapters don't support pre-LBA HDDs. These old disks are all CHS-addressed.

I wanted to take images of such disks. I ended up managing to boot an ancient version of Knoppix from a CD (just booting it was a nightmare) and then using dd_rescue to clone it to a file on a CF card connected vi a CF-to-IDE adapter.

Edit: oh, drive powers off when usb is connected? Might be that the adapter doesn't offer enough power, but if you could get around this you would inevitably run into the problem I describe above.

[–] [email protected] 2 points 2 weeks ago (1 children)

If the drive is spinning when the USB is not plugged in then it's clearly being powered by a separate power supply. Besides, 5.25" hard drives cannot be powered by USB, powered hub or not.

[–] [email protected] 4 points 2 weeks ago (2 children)

... No. The computer has one power supply, and old computers from PB, Gateway, Dell, would have power supplies that produced barely enough wattage to run the hardware it sold with.

You add another device, with its own power draw, and if you go over the limit of what the PSU is able to supply, something gets underpowered and misbehaves.

Using a powered hub means that the power sent to the USB device is provided by the hub, and might make it so that OEM PSU is still sufficient. Here, though, we have already added an ISA>USB card.

Another option is putting in a higher wattage PSU, but I don't know what the connector used was on that machine. It might be hard to find something that would just plug right in.

[–] [email protected] 5 points 2 weeks ago (2 children)

... No. USB hard drive adapters come with their own power supplies if they're intended for 5.25" drives.

[–] [email protected] 7 points 2 weeks ago

You're being downvoted, but you're right. Every adapter I've bought for a full sized hard drive has needed its own power supply. I'm not sure if I've seen one for a PATA drive that didn't come with one.

[–] [email protected] 3 points 2 weeks ago

This is correct, these adapters all come with external power supplies to them run separate from the systems power.

[–] [email protected] 3 points 2 weeks ago

USB prior to version 3 and the type C connector only supplied 5 volts. 5.25" hard drives need 12 volts. No amount of powered hubs or higher wattage PSUs will change that.

[–] [email protected] 10 points 2 weeks ago (1 children)

Oh and the reason you had to enter the HDD settings is because the coin-type BIOS battery died. Replace it, or you're likely to have to do that every time you turn it on.

[–] [email protected] 5 points 2 weeks ago (1 children)

I can't find the coin cell cmos battery on the board...

[–] [email protected] 6 points 2 weeks ago (1 children)

Then the cmos battery is probably in a Dallas DS1287 or similar chip. There are hacks to replace the battery itself with a CR2032 holder, but it requires drilling into the chip.

I bought a DS12887+ to replace it, and socketed it in case it would need replacement again in the future (in another 30 years? :)). But if you want to go this route look up what chip is compatible with the exact one you have.

[–] [email protected] 1 points 2 weeks ago (1 children)

Interesting. Will it just say DS#### on the chip on the board? I'll look for it, that sounds great. Some parts of this board are hard to reach though.

[–] [email protected] 5 points 2 weeks ago

It will say "Dallas DS1287 REAL TIME" and be unusually thick for being a DIP chip.

I just remembered, there's a third possibility for replacement if this is the problem - the nwx287, a hobbyist-made replacement chip that has a cr2032 holder.

[–] [email protected] 7 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

If you have a parallel null modem cable (or even a serial one) you can use the dos interlnk and intersvr command to access the drive from another computer. Not sure if that will help.

Entering the CHS values into bios was common practice on pre pentium level computers. This might explain why your usb adapter doesn't work as the drive is too old to send its geometry.

[–] [email protected] 5 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

You got it. The IDE-USB adapters will technically only work with drives supporting ATA-2 (EIDE and newer).

[–] [email protected] 2 points 2 weeks ago (2 children)

That wouldn't affect whether the existing hard drive would power off, though. It just wouldn't recognize the new drive.

[–] [email protected] 2 points 2 weeks ago

Just because you put +5V, +12V, and ground on the Molex plug doesn't mean the drive is going to be powered up and spinning. The controller on the drive controls the motors (duh) and may be shutting the whole works down if it's receiving what it interprets as invalid or malformed commands.

I was trying the same thing years ago, with a mid-90s HDD, a dedicated power supply for it, and a couple different IDE-USB adapters, and never got it to work. The drive shutting down when USB adapter is plugged in sounds familiar.

[–] [email protected] 1 points 2 weeks ago

This is what I was thinking too. The adapter I have does have its own power supply plugged in to molex. But it turns off when I also plug in usb.

[–] [email protected] 3 points 2 weeks ago

Awesome. Nicely resurrected!