Announcement: 3B1 2nd Hard Disk Upgrade

[John B. Milton]

In article <585 at icus.islp.ny.us> lenny at icus.islp.ny.us (Lenny Tropiano) writes:
>In article <465 at uncle.UUCP> jbm at uncle.UUCP (John B. Milton) writes:
>|>In article <429 at limbic.UUCP> gil at limbic.UUCP (Gil Kloepfer Jr.) writes:
>|>[description of what you get (lots of docs), what it does, price $30, address]
>|>
>|>I had a long conference call this evening (well, last evening) with Lenny and
>|>Gil.  [...]
>
>|>All of this in no way diminishes what I'm doing. As I said in my last posting,
>|>all the design work on my board is done. The PC board is finished, the PAL
>|>equations have been determined, the physical mounting has been determined (one
>|>possible configuration), the software is already done... 
>
>Hmmm, maybe I miss understood on the phone, but I thought you said that
>you didn't have the software (gdisk driver) to handle the 4 drives, and
>it would be a while before something like that existed, if you could
>do it at all.

Lenny, please don't cross post an internal news group (icus.general) to an
external news group.

Sorry to mislead. I meant that the software for TWO (2, II) drives is done. I do
NOT have the software done to have all four drives working.

Well, I couldn't resist...
There was room on my board for another pair of connectors...
I have a spare input and a spare output in the PAL...

I have added another pair of 34 pin connectors to the board so that you can
run your floppy drive cable "through" my board and to the box where your hard
drives are going to live. As it passes through my board, I add one (1) signal
to it. This would, of course be a select line for the second floppy drive.
[DAMN! why doesn't he leave that design alone and put the board out]
This addition in no way affects the other functions of my board. If you don't
want to use it, you don't have to. It requires another wire on the mother board,
which, of course you don't have to put in if you don't want to. As with hard
drives 3 & 4, there is no software hiding in there somewhere to take advantage
of a second floppy drive. This circuit has been on my board for a couple of
weeks now, I just forgot :) to post about it.

The bit I chose to use is D14. This is used by the internal floppy tape drive
to select which stream to use. It is one of 3 bits, and is the regular floppy
drive #2 select line. The floppy drive select names are different from the
hard drive. They start numbering at 1, the second floppy drive is drive 2,
whereas the second hard drive is DDRIVE1.

from <sys/hardware.h>:
#define TSEL2	0x4000			/* 1 = drive select 2 */

Anybody heard anything about a PC manufacturer called Saturn, based in MI?

John
-- 
John Bly Milton IV, jbm at uncle.UUCP, n8emr!uncle!jbm at osu-cis.cis.ohio-state.edu
(614) h:294-4823, w:764-2933;  Got any good 74LS503 circuits?