It's a little hard to guess what sort of interface would have been used to
effect a HDC<=>Host-Adapter interface with 26 conductors, though SCSI/SASI is a
possibility, since there does exist a fairly widely used 25-conductor interface
to that one. It wasn't popular back in the Apple-][ days, though. If it's
intended for internal use only, however, i.e. if there's a box this board goes
in, with the drive and PSU, and a mount for the board on top or bottom of the
drive, or some such, then it's possible that the 26-conductor cable is intended
for use inside the box only and there's some other interface cable configuration
outside the box. Also, it's worth considering that the Apple-][ didn't have a
lot of height to support a 50-conductor, or even 40-conductor cable connector.
Perhaps it's another Apple-ism, forced on the designers by the shape of the box.
I found on GOOGLE that there was once a KONAN HDD Kit for the Apple, ( see
http://download.franklin.com/cgi-bin/franklin/ebookman_free_preview?price10 ).
This might be a clue. I found mention of a"$3,000 price for the Konan 5M
External ST506 Apple Hard Drive Kit in 1979 " that supports this notion.
That same GOOGLE search produced a reference to a SCSI spec of which this table
is a part ...
http://dan.emsphone.com/SCSI2/Docs/FTables/s2tabE.1.html
... and this might also be of interest ...
http://www.classiccmp.org/mail-archive/classiccmp/1998-04/0198.html
A little more digging (I spent about 2 minutes on this) might turn up something.
Dick
----- Original Message -----
From: "Tony Duell" <ard_at_p850ug1.demon.co.uk>
To: <classiccmp_at_classiccmp.org>
Sent: Monday, July 23, 2001 12:29 PM
Subject: Re: Apple ][ boards -- what have I found?
> >
> > I don't know anything about these boards that you don't, but since the name
is
> > hard to read, do you suppose that that "RONAN" board could be from KONAN?
They
>
> I am almost sure you're right. The label is in the silkscreen along one
> edge of the board, and the top half was cut off when the board was
> trimmed. KONAN would fit the parts of the letters I have.
>
> > made disk controllers. Is there enough stuff to suggest it's a disk
controller,
> > e.g. PLL components?
>
> I am almost sure it is a disk contorller. As I said, it's not an Apple ][
> card -- perhaps I should also have said that it doesn't fit a backplane
> at all. The external connectors are a 26 pin header for the host
> interface (I think), a 34 pin + 2 * 20 pin headers (ST506 hard disk would
> look likely), and a power connector, like those found on disk drives. No
> card edges. I think this one is a hard disk controller that possibly
> links to one of the Apple ][ cards as its host adapter.
>
> -tony
>
>
Received on Mon Jul 23 2001 - 14:29:12 BST