8-bit IDE

From: Richard Erlacher <edick_at_idcomm.com>
Date: Mon Apr 17 16:20:41 2000

----- Original Message -----
From: John Wilson <wilson_at_dbit.dbit.com>
To: <classiccmp_at_classiccmp.org>
Sent: Monday, April 17, 2000 1:56 PM
Subject: Re: 8-bit IDE


> On Mon, Apr 17, 2000 at 12:33:04PM -0600, Richard Erlacher wrote:
> > There's physical room for a SCSI, WD100x-05, and an 8-bit IDE on the 12
x 40
> > hole wirewrap layout on the card I'm using. IF I can find two or three
> > drives that work in 8-bit mode, that will be enough. They want to be
thin
> > 2-1/2" drives, though, else they'll stick too far out from the board.
>
> Just stating the obvious: the 2.5" 44-pin connector uses a 2mm metric
> grid, so if your WW area uses a regular 2.54mm grid it'll need some
drilling.
>
Yes, it surely is the obvious. I have a couple of adapters from standard
40-conductor IDE cable + Power to 2.5" standard 44-conductor 2mm connector.
I shortened it from about 3" length with two IDE cables to about 1/2" with a
single IDE cable such that it can fit directly into one of the two wirewrap
areas. Coincidentally, the cable connector points downward, thereby
allowing the adapter to be soldered into the wirewrap area with the pins
protruding onto the wiring side of the board. This enables me to attach
power directly to the adapter and attach signals there as well. This also
permits me to install a normal cable adapter in the other wirewrap area,
which is close to the top of the board, thereby giving me a place for the
standard IDE cable so it can be brought to where the drive sits. This then
is wired in parallel with the adapter's 40-conductor connector, thereby
producing the signals to the 44-pin 2.5"disk drive connector. That then
requires NO DRILLING. (I hate drilling!) If I decide to build a 16-bit IDE
interface channel, I'll build it on a proper wirewrap board rather than
trying to use this bare board.

Dick
>
> John Wilson
> D Bit
Received on Mon Apr 17 2000 - 16:20:41 BST