27 Oct
2024
27 Oct
'24
11:01 p.m.
In 1979 Data General started manufacturing its own two line of 14"
Winchester disk drives - a 12.5 MB [Model 6099] and a 25.5 MB [Model
6103] version. A "quad-density" 1.2 MB 8" floppy diskette drive or two
were often part of the system for installation and backup purposes.
There is usually an ID plate on the back of the disk drive that contains
the model number and DG Product number (i.e. 005-xxxxx-yy) of that
specific unit.
Bruce Ray
Wild Hare Computer Systems, Inc.
Denver, Colorado USA
bkr(a)WildHareComputers.com
...preserving the Data General legacy: www.NovasAreForever.org
Bruce Ray
Wild Hare Computer Systems, Inc.
Denver, Colorado USA
bkr(a)WildHareComputers.com
...preserving the Data General legacy: www.NovasAreForever.org
On 10/27/2024 7:55 AM, Paul Birkel via cctalk wrote:
Can anyone identify the 14" HDD seen in the
following photo (not mine)?
It's unusual in that there are two moving heads on the top surface of the
platter. I presume that there's a fixed head on the bottom surface for the
clock track. This is from a Data General 6100 disc subsystem which is
advertised as 25MB capacity. There's a related model with half that
capacity.
https://forum.vcfed.org/index.php?attachments/img_5116-jpeg.1288418
The only thing that I can say for sure is that it's visually not a Shugart
SA4000 and that exhausts my knowledge on the subject..
While I presume that the 25-signal twisted-pair ribbon cable is for control
signals, there is also a 16(?) line grey ribbon cable connected to the left
side of the DG-specific power control PCB. I'm guessing that would be
data/clock lines from hidden electronics where the 25-signal twisted-pair
ribbon originates; not sure what else may be then happening on the
DG-specific power control PCB.
Thank you for any insights into manufacturer, model, and documentation.
-paul