On Tue, 15 Mar 2005 21:31:57 -0500, Jerome H. Fine
<jhfinexgs2 at compsys.to> wrote:
David Betz wrote:
> Do the drives for the RQDX3 have to be DEC drives or will any MFM
> drive do? It seems like ST225 drives are fairly easy to find.
Yes they are, and yes, they will work without modification, as will ST-251s.
Jerome Fine replies:
I believe the ST225 is an RD31, but please do not rely on that!!!!!!
Yes it is. The ST-251 formats up as an RD32. Since they have fewer
heads than the full-height devices, they are not as fast (it's quick
to switch heads, slower to move them), but they do work. In the
specific case of the ST-225, RT-11 partition size won't be an issue
because 21.4MB is less than 32MB, so don't worry about what version
you are running, as long as it's new enough to have a DU driver.
I have never used an RQDX3 except in a BA23 or BA123, but the schemes
I've seen described in this thread to manufacture a direct RQDX3->hard
drive should all work. If you can lay your hands on a BA23, however,
that would greatly simplify things, as you would have the distribution
wiring included, as well as a write protect switch and activity light
(for one drive, at least... there's an uncommon BA23 front panel that
_can_ support two hard drives and no floppies, or one can make some
hardware mods... apologies if this is confusing... ignore it if you
plan to use only one hard drive, and just know that it will work fine
in a standard BA23).
-ethan