30 Dec
2007
30 Dec
'07
2:39 p.m.
From: dkelvey at hotmail.com
Hi
I just checked on it and your request doesn't make sense.
There was a spec for the ST506 and a newer spec ST506/412.
For your problem, I'd think the number of heads would
be more important. The other issue would be stp time.
Dwight
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From: lynchaj at yahoo.com
Hi,
I am restoring a Vector Graphic computer and would like to add a hard
disk drive. The controller only supports two kinds of hard disk
drives, the ST506 and ST412. The HD controller is hard coded to
support these DRIVES not just a compatible interface and relies on a
special signal present only in these actual drives.
If anyone has one or more of these hard disk drives they would like to
sell me, please contact me or reply here.
Thanks!
Andrew Lynch
Hi Andrew
First, I'm not sure what you mean by ST506 and ST412. I thought
these were different in that one had a signal used for write precompensation
while the other used the same line for a head select.
If you use a newer drive that has built in precomp, just
tie the line going to the drive so that it ignores the Precomp
from the controller.
I seem to recall some signal from the drive that was on
the data cable. I don't recall what it was that came from the
drive but it seems like it was some type of write protect or
something. In any case this line can be cut and tied
as well.
Dwight