Hitachi FDD-412A 8 inch floppy drive
Hitachi FDD-412A 8 inch floppy drive
Dear disk experts
I am trying to emulate/replace a Hitachi FDD-412A 8" floppy drive with my HxC Floppy Emulators (have both SD and Gotek). Unfortunately I do not have any documentation for this drive and its 50-pin IDC ribbon cable connector. It also seems impossible to find any details in the web .
The only thing I understand: it is not a standard Shugart connector (NOT as documented under https://old.pinouts.ru/HD/8InchDisk.shtml)!
Has anybody successfully replaced this kind of floppy drive? Who can deliver further information about IDC pinout, signals, ...?
The drive is connected to an Okuma Campus 5000 CNC System an data should be recovered to allow drive replacement.
As far as I know, the system works with SS and DS disks having SD and DD.
You can find pictures of the drive on http://www.retrocomputing.net/index.php ... Fotografie
Any help is appreciated - Thanks
Martin
I am trying to emulate/replace a Hitachi FDD-412A 8" floppy drive with my HxC Floppy Emulators (have both SD and Gotek). Unfortunately I do not have any documentation for this drive and its 50-pin IDC ribbon cable connector. It also seems impossible to find any details in the web .
The only thing I understand: it is not a standard Shugart connector (NOT as documented under https://old.pinouts.ru/HD/8InchDisk.shtml)!
Has anybody successfully replaced this kind of floppy drive? Who can deliver further information about IDC pinout, signals, ...?
The drive is connected to an Okuma Campus 5000 CNC System an data should be recovered to allow drive replacement.
As far as I know, the system works with SS and DS disks having SD and DD.
You can find pictures of the drive on http://www.retrocomputing.net/index.php ... Fotografie
Any help is appreciated - Thanks
Martin
Re: Hitachi FDD-412A 8 inch floppy drive
Lot's of IC on this drive... Can you make a better picture of the PCB ?
Re: Hitachi FDD-412A 8 inch floppy drive
Hi Jeff
Here are some images of the Drive and the PCBs.
Thanks for your help!
Martin
Here are some images of the Drive and the PCBs.
Thanks for your help!
Martin
- Attachments
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- FloppyDriveBottom.jpg (122.8 KiB) Viewed 12154 times
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- FddPcbTop.jpg (171.69 KiB) Viewed 12154 times
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- FddPcbBottom.jpg (165.45 KiB) Viewed 12154 times
Re: Hitachi FDD-412A 8 inch floppy drive
Trying to understand the pin assignments on the 50-pin IDC connector I followed the PCB traces ... still a work in progress.
I will also try to find some Okuma Maintenance Manuals.
I will also try to find some Okuma Maintenance Manuals.
- Attachments
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- Hitachi_FDD-412A-IDC_50p.png (200.19 KiB) Viewed 12144 times
Last edited by m.vgunten on Sun Jan 19, 2020 2:29 pm, edited 1 time in total.
Re: Hitachi FDD-412A 8 inch floppy drive
I use here an YD-180 to dump 8" floppy disks and this one also use a non-standard pinout, maybe this is the same as your drive pinout.
The YD-180 is equivalent to this one :
https://deramp.com/downloads/floppy_dri ... Manual.pdf
If you have an oscilloscope you can check if the read data line match with the above pdf.
The YD-180 is equivalent to this one :
https://deramp.com/downloads/floppy_dri ... Manual.pdf
If you have an oscilloscope you can check if the read data line match with the above pdf.
Re: Hitachi FDD-412A 8 inch floppy drive
Unfortunately it is not looking like a YD-180 pinout. I have most of the signals on odd pin numbers and measured the /INDEX pulse on pin 7. Just updated the table above ...
Thank you anyway!
Thank you anyway!
Re: Hitachi FDD-412A 8 inch floppy drive
Here some additional images of the Floppy Controller PCB.
Re: Hitachi FDD-412A 8 inch floppy drive
Is there a NEC 765 floppy controller ?
Re: Hitachi FDD-412A 8 inch floppy drive
Bingo!
Thanks a lot your hint will help finding the signals on the floppy connector!
http://www.cpcwiki.eu/imgs/f/f3/UPD765_ ... _OCRed.pdf
Thanks a lot your hint will help finding the signals on the floppy connector!
http://www.cpcwiki.eu/imgs/f/f3/UPD765_ ... _OCRed.pdf
Re: Hitachi FDD-412A 8 inch floppy drive
Yes. And we now know that the sector format used is pretty standard .m.vgunten wrote: ↑Mon Jan 20, 2020 10:08 pmBingo!
Thanks a lot your hint will help finding the signals on the floppy connector!
NEC-D765AC.jpgNEC-D765AC-pinout.jpg
http://www.cpcwiki.eu/imgs/f/f3/UPD765_ ... _OCRed.pdf
Re: Hitachi FDD-412A 8 inch floppy drive
Updated pin assignments on the 50-pin IDC connector after having a closer look to the floppy controller PCB ... still a work in progress.
Re: Hitachi FDD-412A 8 inch floppy drive
I can now control the floppy drive and read some date on the /RD pin - see bottom line in diagram below.
I further assume data separator clock /SEPC and data /SEPD on the two lines above (D16&D17) ... but I'm not sure at all!
I further assume data separator clock /SEPC and data /SEPD on the two lines above (D16&D17) ... but I'm not sure at all!
Re: Hitachi FDD-412A 8 inch floppy drive
Yes for sure this is data separator outputs !
Re: Hitachi FDD-412A 8 inch floppy drive
The pin out is the same as a NEC FD1165 the NEC drive has EITHER a 50 pin card edge or 50 pin IDC the pins outs #'s are the same for both.
There is a gent out there in the New England area of the US that sells a 50pin adapter to go to shugart 34 pin. I have an extra if he is no longer selling them.
Be aware this particular floppy drive does DS/DD but it is a DS/HD drive!! When it is in HD mode (if your disks are labeled HD256,HD512 or HD1024) they are very very unique media its about a 6MB floppy drive in HD mode using the proper controller.
If you have any HD media you want to get rid of I'd be interested in it.
Joe
There is a gent out there in the New England area of the US that sells a 50pin adapter to go to shugart 34 pin. I have an extra if he is no longer selling them.
Be aware this particular floppy drive does DS/DD but it is a DS/HD drive!! When it is in HD mode (if your disks are labeled HD256,HD512 or HD1024) they are very very unique media its about a 6MB floppy drive in HD mode using the proper controller.
If you have any HD media you want to get rid of I'd be interested in it.
Joe
Re: Hitachi FDD-412A 8 inch floppy drive
Dear Joe
Thank you very much for your hint.
Do you mean the "FDADAP floppy disk adapter"? If not, please let me know some more details about it.
Unfortunately, the discs are in short supply also for us and we have no HD media left.
Thx Martin
Thank you very much for your hint.
Do you mean the "FDADAP floppy disk adapter"? If not, please let me know some more details about it.
Unfortunately, the discs are in short supply also for us and we have no HD media left.
Thx Martin