Drive 8inch Basf 6104 old model manual

[enrico]

Here in Italy in the years 1979-1981 some engineers created a computer based on the Z80 which was equipped with a pair of 8-inch drives.
Recently I got to test them.
To do this I connect them to my Ferguson Bigboard which has FDC 1771 and I try to read sectors of single density pre-recorded floppy disks.
While with other drives (for example REMEX RFD4000) I have no reading problems, with all BASF 6104 drives I always have a seek error.
I searched on internet for their manual but there is only the technical manual of the version of the new BASF 6104 model (the one in which the jumpers named JJ1 to JJ12 are present) while in the old BASF 6104 model the jumpers are called from B1 to B33 .
For similarity, comparing the way for drive select in the two models, I was able to no longer receive not ready, but I always receive this seek error by trying to test as many as 5 8-inch BASF 6104 drives.
I can't believe that all of them could be out of service togheter.
Can anyone help me?
Thanks
Enrico

New model picture
https://www.dropbox.com/preview/Dri...e 8inch BASF 6104 New Model.jpg?role=personal
New model Manual
https://www.dropbox.com/preview/Dri...nual (80307-048-BASF-6104)l.pdf?role=personal

Old model picture
https://www.dropbox.com/preview/Dri...e 8inch BASF 6104 OLD Model.jpg?role=personal

 

[Chuck(G)]

I'm looking at the technical manual on bitsavers.

Perhaps its sloppy technical writing, but the opening page says "the diskette is rotated at 300 RPM...". That's not right--8" drives spin the disk at 360 RPM. This is corrected on the next page.

I don't know what your software does, but generally, a "Seek Error" could be produced by the software reading a different track number from an ID address header than what was expected. Usually, this is symptomatic of the head carriage not being where it's supposed to be. Dirt or solidified lubricant in the positioner mechanism can cause this; usually, this is the result of the stepping/settling time for the drive being too fast.

I suppose a "Seek error" might be generated if the track zero sensor is bad, but that depends on the software again.

A first thing to try would be to increase the seek stepping time.

 

[enrico]

Thanks for the reply.
With regard to the information provided by me with the previous post, I must add in the meantime that the Assy of which the scheme is numbered 81098. Through Google you will find the relative setting here
https://www.abc80.net/archive/luxor/diskdrives/drives/BASF-6104-Aug1981.pdf
The other "old" BASF 6104 models instead have Assy 81118, but with this information, however, I cannot find the wiring diagram or the setting of jumpers from B1 to B33.


Rather,i am not practical to know howto do thorough cleaning (WD ???), and also what exactly clean well nor what programs to use to set different search times.


Very trivially I was hoping to be able to gain a stable situation through my Ferguson bigboard 1 which has command R0,00,01 to perform the reading on unit 0, track 0 and sector 1 which normally works well on any unit that is actually functioning and with a good disk. On the other hand, the 8 "REMEX FRD4000 unit performs the command correctly without problems.


A long time ago I had used Dunfield's IMD program to create floppy disk images 8 ”as well as creating bootable CP / M diskettes.


In the meantime I will try to better verify the mechanics that seemed to me sufficiently clean, can you recommend me some good programs to do accurate tests?


Thank you for your time.


Enrico