[comp.unix.xenix] Adaptec controller/Miniscribe 6085?

tyager@apollo.COM (Tom Yager) (09/23/88)

Has anyone tried the Miniscribe 6085 drive with an RLL
controller? I called the manufacturer who says they don't
recommend it, but since they market a separate, more
expensive drive for RLL use, I would expect them to say
that.

If it won't work, fine. Their RLL drive is the 6128 and
goes for about $900 with the Adaptec controller. Anyone
out there who has had experience with this combination?

I would be using this stuff with Xenix, er, SCO Unix/386
(a.k.a. Xenix v2.3.1) and would like to hear from anyone
who cares to comment about the use of RLL with this
OS.

As always, thanks in advance. Please email replies to me
at "tyager@apollo.com".

(ty)
-- 
Tom Yager, Apollo Computer
ARPA: tyager@apollo.com -or- tyager%maxx@m2c.m2c.org
-- These are my opinions alone. So there. --
"I like life; it's something to do."

chip@vector.UUCP (Chip Rosenthal) (09/25/88)

In article <3e9fa283.6bad@apollo.COM> tyager@apollo.COM (Tom Yager) writes:
>Has anyone tried the Miniscribe 6085 drive with an RLL controller?

For the uninitiated, the Miniscribe 6000 series is:

			6128	6079	6085	6053	6032

Formatted Capacity (MB)	110.1	68.8	71.3	44.6	26.7
Sectors Per Track	26	26	17	17	17
Heads			8	5	8	5	3
Cylinders		1024	1024	1024	1024	1024
Recording Method	RLL	RLL	MFM	MFM	MFM

A lot of people have told me about success running MFM drives with an RLL
controller.  I wouldn't do it.  But then again, I'm one of those super
paranoid types who won't accept an 80386-16 in a "20MHz" computer.

>If it won't work, fine. Their RLL drive is the 6128 and
>goes for about $900 with the Adaptec controller. Anyone
>out there who has had experience with this combination?

Yes.  I've been bitching and moaning now for over a month about this.  I
am trying to run SCO XENIX 386 2.2 on an Everex Step 386/20 with a
Miniscribe 6128 and an Adaptec ACB2372.  I've been having all sorts of
problems -- usually paging system panics but occasionally a general
protection trap.  My initial best guess was either a disk or memory
problem.

We ran Everex's memory diagnostics for two days.  No problems found.

We screwed around with the Adaptec strappings for a bit with no improvement.
Specifically, we messed around with the J14 strap for wait states and
the J12 straps for BIOS selection.

We then swapped it out for a plain old WD 1:1 MFM controller.  Problems
went away.

Monday, I'm going to take another shot using a WD RLL controller.  If
that works then I'll be in fat city.

Three points to this rambling story:

(1)  Pathalias is the best diagnostic I've found to date.  If a system
     is going to crash, this will do it.  I prefer to get a couple of
     invocations going.  I use multiple copies to avoid having the text
     segments shared.

(2)  Seeing that I don't have anything conclusive yet, I'd hate to condemn
     the Adaptec 2372.  But, it looks really suspicious from where I'm
     sitting.

(3)  If I hear one more PC salesman say "but it works fine with DOS",
     I will probably kick him in the nuts.

I realize the original poster asked for mailed responses, but I'd be
interested in hearing from other folks with experience with the 2372.
-- 
Chip Rosenthal     chip@vector.UUCP | I've been a wizard since my childhood.
Dallas Semiconductor   214-450-0486 | And I've earned some respect for my art.

rick@pcrat.UUCP (Rick Richardson) (09/25/88)

In article <569@vector.UUCP> chip@vector.UUCP (Chip Rosenthal) writes:
>
>I realize the original poster asked for mailed responses, but I'd be
>interested in hearing from other folks with experience with the 2372.

I've used the Miniscribe 6128 and Adaptek 2372 combo under 386/ix since
Feb. with pretty good success.  The only trouble I had was an infant
mortality problem on the floppy side of the controller.  A replacement
controller cured the problem.  It helps to have a second one around to
narrow down these problems -- I was ready to blame the floppy drive.
-- 
		Rick Richardson, PC Research, Inc.
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