RE: 1571-rw heads Motherboard versions

From: Ray Bryan (
Date: 2001-07-27 22:03:12

I worked with a metal man for about 6 months trying to do that
but the real problems begins with the azimuth alignment (side to
side) not front to back.  I could not get that working.  I do have a
small number of whole assembly R/W heads (6-8), if any one is looking.


On Fri, Jul 27, 2001, at 09:46 AM, Marko_Mäkelä wrote:

> On Thu, 26 Jul 2001, Raymond C. Bryan wrote:
> > MOS used plastic packaging on most of its chips in the 64s except 656x
> > video chips which are almost all ceramic and less susceptable to
> > packaging failures.
> This may be true for NTSC video chips, but in my experience, PAL video
> chips have been mostly in plastic packaging since the 6569R3.  The first
> revision, 6569R1, was probably packaged only in ceramic.  Of the 6569R3, I
> have seen both plastic and ceramic version.  (I haven't seen an R2, and
> according to the week/year and production run codes on the chips whose
> data I've collected, it could have been around at most for some weeks.)
> Of the 6569R4 and R5 and 85xx chips, I'm not sure if I have seen a ceramic
> version.
> > 1571s used a leaf spring suspension for the upper read/write head that
> > will tear and thus not put proper tension on the disk to read.  
> > Especially this happened when the drives were left open (spring up) no
> > disk in the drive!
> So true.  Do you know of any easy fix for this?  Or does someone know
> someone who works at a facility that could manufacture those springs for
> next to nothing? :-) Metal parts are difficult to repair, especially
> springs.
>     Marko
>        Message was sent through the cbm-hackers mailing list

|Raymond C. Bryan  651-642-9890 vox | The battle is sometimes |
|Raymond Computer  651-642-9891 fax | to the small for        |              
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|St Paul MN  55114     | the harder they fall.   |
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