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From: bob@omni.com (Bob Weissman)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: 8-bit RLL hard disk controller suggestions?
Keywords: disk, controller, RLL
Message-ID: <6306@borabora.omni.com>
Date: 10 May 91 22:59:47 GMT
Expires: 10 Jun 91 19:00:00 GMT
Organization: Interphase West, Mountain View, CA
Lines: 25

I have a Western Digital WD1002A-27X hard disk controller in
my old XT clone.  It's controlling a Seagate ST-238R.

It works fine at 4.77 MHZ, but often locks up and gives "disk
not ready" errors when I run the bus at 8 MHz.  It is possible
that my clone's timing is a little off, I guess, but 8 MHz
just doesn't seem fast enough to cause this type of problem.
None of my other cards seem to have any trouble at 8 MHz.

The Western Digital technical support line says there is no fix
or workaround other than running at the slower speed. (Great.
After I wait on hold for 10 minutes at my expense.  Thanks a lot.)

So, can anyone recommend an RLL controller for my XT which will
run at 8 MHz on a possibly off-speed clone?  Maybe you have a
cheap used one to sell me?

Or can anyone tell me how I can test (and hopefully adjust) the
speed of my XT accurately?

Thanks,
-- 
Bob Weissman
Internet:	bob@omni.com
UUCP:		...!{apple,decwrl,pyramid,sgi,uunet}!omni!bob