22 Mar
1998
22 Mar
'98
10:18 a.m.
On Sun, 22 Mar 1998, Pete Turnbull wrote:
On Mar 22, 7:16, Doug Spence wrote:
Unfortunately, Pete, very few of the full high floppy drive makers were
considerate enough to mark them that way. That pretty much came about
when they went to Berg jumpers for selection.
Subject: Re: Kaypro: 81-149C vs. 81-232
Well, I've repeated what I did the other night. I plugged the Kaypro II
into the Kaypro 2's drives, and vice versa. Just the ribbon cable, not
the power. Whichever machine was plugged into the Kaypro II's drives was
able to boot, the machine plugged into the 2's drives just sits there with
the bootup message and eventually beeps and says "I cannot read your disk"
(or similar).
I don't know much about Kaypros, but is it possible that one of the sets of
drives is 40-track and the other is 80-track? Or that one set is single-sided
and the other is double-sided? When you start up the machine and it tries to
boot, does a light come on, on the disk drive (which would indicate that the
drive is being accessed)?
Anyway, the only other thing I could try is to
make drive B in the 2 think
that it's drive A, to see if I can boot from there. Does anyone know how
these drives decide which one's A and which one is B? And can I switch
their identities without removing the drives from the metal housing? I
don't have the proper screwdriver to remove the drives.
Usually there's a set of jumpers, or sometimes a small DIL switch pack, which
select one of four disk addresses. They may be labelled DS0, DS1, DS2, DS3 or
perhaps D1, D2, D3, D4. D0=A and D1=B. You just need to switch the jumper
settings. Even if they're not labeled, you should find that all but one of the
jumpers (the drive select jumper) in one drive match the jumpers in the other
drive (of the ame pair). If you open up the drive case and tell us what the
make and model number of the
actual drive mechanism is, someone can probably tell you the jumper settings
and whether the drive is 40/80 or SS/DS.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
- don
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