It won't help you much but I'm going to state the obvious: You don't put a PLD on a floppy drive, a piece of tech that was pretty much perfected into single LSI chip by the time HD 3.5" drives were introduced, for no reason. And also it looks like the drive control might be non-standard, some of the odd-numbered pins look to be connected to some signals rather than GND.
Since it's a Sony make sure you are connecting the ribbon the right way, there's a cutout on the PCB for the notch on the plug and that seems to be in correct position but if the drive has a plastic connector rather than bare pins it might have another cutout on the wrong side. Sony was notorious for doing this for some reason. Rather than trust the cutout/notch pay attention to the pin numbering on the PCB silkscreen and make sure the colored wire in the ribbon is indeed on pin 1. If that still doesn't work then take a closer look at the jumper block, make sure it's set correctly to drive 1 (assuming it starts at 0, if it starts at 1 then you need to set drive 2).

The model number doesn't seem to correspond to something special. Unless Deunan is spot on with his observations of course!

Look at the solder blobs to the right of the connector marked SH19. Remove the DS0 blob and make the DS1 blob and try again with a PC.

I'll try it 😀

ontrca wrote on 2023-05-08, 23:13:

I'll try it 😀

I tried, but it didn't work.

mdog69 wrote on 2023-05-08, 22:46:

Look at the solder blobs to the right of the connector marked SH19. Remove the DS0 blob and make the DS1 blob and try again with a PC.

I tried, but it didn't work.

ontrca wrote on 2023-05-09, 01:07:

I tried, but it didn't work.

Does it mean the PC BIOS cannot detect the drive?
Or inserted a floppy disk and the drive cannot read it?

sangokushi wrote on 2023-05-09, 03:36:

ontrca wrote on 2023-05-09, 01:07:

I tried, but it didn't work.

Does it mean the PC BIOS cannot detect the drive?
Or inserted a floppy disk and the drive cannot read it?

I bought 3 of these floppy drives (new in the box) and none of them are recognized by multiple PCs.

sangokushi wrote on 2023-05-09, 03:36:

ontrca wrote on 2023-05-09, 01:07:

I tried, but it didn't work.

Does it mean the PC BIOS cannot detect the drive?
Or inserted a floppy disk and the drive cannot read it?

They cannot be recognized by the BIOS so they cannot read a floppy.

Huh, there is a solder jumper for the drive select, I never noticed it. I figured that would be set via jumpers.

ontrca wrote on 2023-05-09, 04:06:

They cannot be recognized by the BIOS so they cannot read a floppy.

Are you setting them up at 1.44M? Did you try turning on floppy seek at boot option - is there head movement? Is there anything, like the busy light at any point?

Deunan wrote on 2023-05-09, 08:37:

Huh, there is a solder jumper for the drive select, I never noticed it. I figured that would be set via jumpers.

ontrca wrote on 2023-05-09, 04:06:

They cannot be recognized by the BIOS so they cannot read a floppy.

Are you setting them up at 1.44M? Did you try turning on floppy seek at boot option - is there head movement? Is there anything, like the busy light at any point?

I don't know what the jumpers are for.

ontrca wrote on 2023-05-09, 11:00:

I don't know what the jumpers are for.

These probably control some of the non-standard features of these drives. But the important thing is what did you set in BIOS? Is the floppy set to 1.44M? Is the seek on boot option on?

ontrca wrote on 2023-05-08, 18:11:

I bought 3 of these new in the box.
None of them work in a PC.
I Googled them and I can't find anything, can someone help me? (:

Pics of the box?

There's still an auction on ebay with many of them (from California)

ontrca wrote on 2023-05-08, 18:11:

I bought 3 of these new in the box.
None of them work in a PC.
I Googled them and I can't find anything, can someone help me? (:

As another user mentioned, it is very strange to have an Altera part on a supposedly standard floppy drive. Unfortunately there's no information on the Sony branded chip.

I don't know if you're good with electronics, but if it were me I'd connect power to the drive and try turning on the motor and stepping the head, just to see if that works. If so, there's no reason it shouldn't at least perform a head seek when connected to a computer. It's actually not difficult at all to do this. See https://polprog.net/blog/fdalign/

That web page is to calibrate a drive, but it has great instructions on getting the drive to do something.

Also, have you taken the top cover off to see if there's anything non-standard in there?

It’s a different FDD but look at the jumper

Back in the day I bought a box of Sony floppy drives and none of them worked in the machines I was building (on Intel branded P4 motherboards). I swapped the drives for a different brand.

Could these, MPF42C-2, have been from an apple macintosh computer ?

eesz34 wrote on 2023-05-09, 16:29:

As another user mentioned, it is very strange to have an Altera part on a supposedly standard floppy drive. Unfortunately there' […]
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ontrca wrote on 2023-05-08, 18:11:

I bought 3 of these new in the box.
None of them work in a PC.
I Googled them and I can't find anything, can someone help me? (:

As another user mentioned, it is very strange to have an Altera part on a supposedly standard floppy drive. Unfortunately there's no information on the Sony branded chip.

I don't know if you're good with electronics, but if it were me I'd connect power to the drive and try turning on the motor and stepping the head, just to see if that works. If so, there's no reason it shouldn't at least perform a head seek when connected to a computer. It's actually not difficult at all to do this. See https://polprog.net/blog/fdalign/

That web page is to calibrate a drive, but it has great instructions on getting the drive to do something.

Also, have you taken the top cover off to see if there's anything non-standard in there?

I took the cover off.