🚀 go-pugleaf

I hope someone can help me with this.  I originally had a Seagate ST506
5MB drive in my Rainbow - I replaced it with a 20MB ST225 a couple of years
ago.  My wife has a PC clone and we thought it would be neat to put even
a 5MB drive in it.  So, I bought a Western Digital disk controller for $70
mail order, and connected the whole thing up.  I had all the drive parameters
(153 cylinders, 4 heads, etc) and fed them to the WD formatter (it's in
BIOS on the WD board accessed through DEBUG).  The drive made clunking and
stepping noises, which SOUNDED like it was formatting, but it wasn't in
reality - the program ends with a "nothing done exit".  Now, when I tried
to run FDISK anyway, I noticed that selecting either fixed disk 1 or fixed
disk 2 caused my 5MB drive to respond.  My deduction from the above is that
I need to install some kind of jumper on the drive to perform a correct
"drive select".  Of course, I have no technical documentation for the ST506!

Can someone point  me in the right direction on this problem?  Any assistance
will be much appreciated.  For example, is a 5MB ST506 which was originally
in a Rainbow different from a "generic" ST506? (i.e. did DEC modify it, aside
from testing it to comply with their more stringent quality control standards?)

Again, in summary, I'm trying to make my old Rainbow ST506 drive work with
a WD hard disk controller in a PC/XT clone.


                                Jim O'Brien
				Department of Chemical Engineering
				Yale University
				2159 Yale Station
				New Haven, CT 06520, U.S.A.
				+1 203 432 4382 (days)
				+1 203 322 7222 (eves)
                                                         
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