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Anyone know what the strapping connections on a NEC combo floppy are?


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#1 FDOS OFFLINE  

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Posted Fri Jun 8, 2018 6:25 PM

I have a NEC combo floppy drive consisting of 5.25" FD5839H and a 3.5 FD1158C.  Currently, the 5.25" is accessed as DSK1 and the 3.5" as DSK2, so correctly strapped, but I believe the 5.25" is strapped as 1.2MB or 360 RPM.  I need to change this to 300 RPM, but I don't know which set of pins to strap.  Can anyone help me with this or tell me where I can find this info?



#2 OLD CS1 OFFLINE  

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Posted Fri Jun 8, 2018 7:01 PM

To answer your thread title, those straps are the entry to a level of hell you may want to avoid, but I wish you luck if you continue and hope you can report success.  I have tried with Epson, TEAC, and NEC combo drives.  No matter what I do I cannot get the 5.25" mechanism to run 300rpm.

 

Vaya con Dios.



#3 FDOS OFFLINE  

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Posted Sat Jun 9, 2018 10:13 AM

To answer your thread title, those straps are the entry to a level of hell you may want to avoid, but I wish you luck if you continue and hope you can report success.  I have tried with Epson, TEAC, and NEC combo drives.  No matter what I do I cannot get the 5.25" mechanism to run 300rpm.

 

Vaya con Dios.

 

I'm really hoping someone will have a better response, as it would be an ideal solution to have both a 5.25"" as DSK! and a 3.5" as DSK2, in addition to a GOTEK, all in a TI PEB.  Otherwise, I will have to remove card cage & PS from the PEB and install in mid-tower PC case.  Big chore for my non-nimble fingers.  Which I can't even cross while waiting on that answer.  Please someone HELP me (sadly, fingers not crossed).



#4 arcadeshopper OFFLINE  

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Posted Sat Jun 9, 2018 10:28 AM

What's ideal and what's possible are sometimes mutually exclusive.. I have not heard of anyone that could make that drive combo do anything but hd PC setup

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#5 OLD CS1 OFFLINE  

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Posted Sat Jun 9, 2018 10:35 AM

 

I'm really hoping someone will have a better response, as it would be an ideal solution to have both a 5.25"" as DSK! and a 3.5" as DSK2, in addition to a GOTEK, all in a TI PEB.  Otherwise, I will have to remove card cage & PS from the PEB and install in mid-tower PC case.  Big chore for my non-nimble fingers.  Which I can't even cross while waiting on that answer.  Please someone HELP me (sadly, fingers not crossed).

 

I have a metric shit-tonne of drive manuals I captured while doing some work a while back.  They are in a state which gives disarray a good look.  I will see if I happen to have one for those drives, or if I happened to stumble across one on das Interwebs and stashed it in my bookmarks.



#6 FDOS OFFLINE  

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Posted Sat Jun 9, 2018 10:53 AM

 

I have a metric shit-tonne of drive manuals I captured while doing some work a while back.  They are in a state which gives disarray a good look.  I will see if I happen to have one for those drives, or if I happened to stumble across one on das Interwebs and stashed it in my bookmarks.

 

I appreciate your efforts on my behalf.  If successful, maybe even others will benefit from a good idea, as it should be possible because the 3.5" is 300 RPM for HD, not 360 RPM, as this is ED or 2.88 MB.  If these combo drives are 2.88 MB for the 3.5" then that explains the problem, both spin at 360 RPM.  Too bad for us!



#7 Ksarul OFFLINE  

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Posted Sat Jun 9, 2018 11:46 AM

A lot of people have tried--and failed, to get one of the combo drives to work successfully. Every attempt I have heard of was able to get the 3.5 drive to work, but the 5.25 drive just doesn't like our machine. Even some reported attempts at surgery within the drive mechanism to slow it down to 300 RPM don't have the desired effect. . .I think Sisyphus had a better chance of success at his task than those trying this one out will have.


Edited by Ksarul, Sat Jun 9, 2018 11:46 AM.


#8 FDOS OFFLINE  

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Posted Sat Jun 9, 2018 12:43 PM

A lot of people have tried--and failed, to get one of the combo drives to work successfully. Every attempt I have heard of was able to get the 3.5 drive to work, but the 5.25 drive just doesn't like our machine. Even some reported attempts at surgery within the drive mechanism to slow it down to 300 RPM don't have the desired effect. . .I think Sisyphus had a better chance of success at his task than those trying this one out will have.

 

Yes, I now believe this is true, as I've confirmed that there is no strapping option that will change the RPM of either drive, as they both have their own drive motor!  Unless the motor is changed out there is little chance of getting the spin speed within the 300 RPM tolerance for successful read and write operations by any other means. 






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