Tatung Computer Forum

I think they are a different drive altogether

"i think they are a different drive"

sirmorris wrote: ↑Sat Nov 09, 2019 10:18 pm "i think they are a different drive"

Well the Teac direct drive unit looks like a very well made and expensive drive. The ones out of my 6128 and +3 looks like Sugar got them out of Arthur Daley’s lockup.

Are the discs that don’t work known working discs?

Yes, and from a variety of sources too If you check the video, do you think the movement is restricted?

If you're happy that the drives are free of gunge and gunk, that the movement is free and lubricated then the issue could be head alignment.

I don't know much about this subject other than if the heads are mis-aligned, due to a knock or bump perhaps, then they will fail to find the tracks on the disk and thus be unable to read them. It might be that the konami disk is a little less un-aligned than the others.

Do you have a model number for the drive itself? It might be worthwhile googling for a service manual for it. I doubt there'll be one but you never know. Most tutorials insist you need a special alignment disk and an oscilloscope but I think it could be done using trial and error, albeit a bit more slowly

Here's one, for a more modern drive but I think the principles will be similar.

Teac fd-30a. My only worry is that the head appears to have restrictive movement. By that I could hand wind the work gear out, and then connect the head, so at rest it’s more in the middle of the gap. I’m not sure where the starting position should be? Does eveyrone elses start with the head at the bottom, and the gear wound fully in?

If other drives are anything to go by I think the head may just be parked wherever it was last used.
If you do a CAT in CPM presumably that would be track 0 which will be one end of the full travel?

Does cat work from mos?