On Sun, 22 Mar 1998, Pete Turnbull wrote:
> On Mar 22, 7:16, Doug Spence wrote:
> > 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).
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.
> 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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Received on Sun Mar 22 1998 - 18:18:53 GMT