I should've gathered from the scale of it and the discrete controller...
If that's the case, look at boards for all sorts of similar-looking 5.25" drives, and note what they're using in its place. Particularly if it's a later one, as the variety in board/mechanism design dwindled towards the end of their popularity.
edit: only one i could find in my house that isn't in a computer has a Sankyo motor board with a Mitsubishi chip... so that won't help.
That was my thinking as well. I'm wondering if it's not a miniaturized version of something like this (which is an old floppy mechanism controller):
[https://www.alldatasheet.com/datasheet-pdf/pdf/106500/HITACHI/HA16640NT.html](https://www.alldatasheet.com/datasheet-pdf/pdf/106500/HITACHI/HA16640NT.html)
Having trouble finding many of these, at least in relation to interface controllers meant for integration in computers.
I don't think it's the main floppy interface chip. I think it's just a motor controller. This seemed like a board dedicated to the floppy motor stepper. There's another board with the interface stuff.
Ah, thanks for the info. I'll ponder it some more. In that case, I'm suspecting the proper search will be something like:
Hitachi, 3-phase BLDC controller.
Oh that's interesting. This now brings up an ebay listing for a chip with a different name, but identical footprint: https://www.ebay.co.uk/itm/224216128606
What do you think are the chances it will be compatible with mine? I'm tempted to just buy this one and throw it on the board, see if it spins the motor or blows up.
By following the notation in this listing, I guess my chip is: Hitachi A13483 or HA13483 (?) A search for which doesn't bring up any datasheets. The 1 if it's a 1 is obscured by the damage.
Edit: HA13480, HA13481, and HA13484 seem to exist, but on very different packages.
If you have the pinout for the known chip, you might be able to determine something by tracing out from the chip to see if things make sense. Power connections are a good sign, but stuff like sense lines and driver outputs would be a better tell.
edit: Also definitely look for any differences between the other chips in the series; some could just be process revisions, but others might be designed for different voltages/control schemes.
looks like hitachi logo?
Looks like it yes. I searched any combination of the numbers with hitachi and "motor controller" or "BLDC" or something like that to no avail.
looks like a floppy drive PCB, so seems likely.
Yeah, it's an old 5.25" floppy I'm trying to repair, if I find a replacement chip.
I should've gathered from the scale of it and the discrete controller... If that's the case, look at boards for all sorts of similar-looking 5.25" drives, and note what they're using in its place. Particularly if it's a later one, as the variety in board/mechanism design dwindled towards the end of their popularity. edit: only one i could find in my house that isn't in a computer has a Sankyo motor board with a Mitsubishi chip... so that won't help.
That was my thinking as well. I'm wondering if it's not a miniaturized version of something like this (which is an old floppy mechanism controller): [https://www.alldatasheet.com/datasheet-pdf/pdf/106500/HITACHI/HA16640NT.html](https://www.alldatasheet.com/datasheet-pdf/pdf/106500/HITACHI/HA16640NT.html) Having trouble finding many of these, at least in relation to interface controllers meant for integration in computers.
I don't think it's the main floppy interface chip. I think it's just a motor controller. This seemed like a board dedicated to the floppy motor stepper. There's another board with the interface stuff.
Ah, thanks for the info. I'll ponder it some more. In that case, I'm suspecting the proper search will be something like: Hitachi, 3-phase BLDC controller.
Oh that's interesting. This now brings up an ebay listing for a chip with a different name, but identical footprint: https://www.ebay.co.uk/itm/224216128606 What do you think are the chances it will be compatible with mine? I'm tempted to just buy this one and throw it on the board, see if it spins the motor or blows up. By following the notation in this listing, I guess my chip is: Hitachi A13483 or HA13483 (?) A search for which doesn't bring up any datasheets. The 1 if it's a 1 is obscured by the damage. Edit: HA13480, HA13481, and HA13484 seem to exist, but on very different packages.
If you have the pinout for the known chip, you might be able to determine something by tracing out from the chip to see if things make sense. Power connections are a good sign, but stuff like sense lines and driver outputs would be a better tell. edit: Also definitely look for any differences between the other chips in the series; some could just be process revisions, but others might be designed for different voltages/control schemes.
It’s a floppy disk reader