H-89....

From: Dwight Elvey <elvey_at_hal.com>
Date: Fri Oct 27 22:43:44 2000

Hi Gene
 I don't have a way to copy stuff easily but I do have
some manuals and docs. I bought a H-89 when they first came
out. After the 2K for the machine, I was too straped to
buy the OS. I hand disassembled the H-17 ROM and figured
how to read and write to the floppy. I took a 8080 listing
for a FIG Forth and put that on it with my disk interface
code. In any case I have a Forth that will boot stand alone.
Ofer the years I aquired the OS and some other software.
I descovered that the way Heath kit was using the disk
was real bad because it required a revolution of the disk
for each consecutive sector. In my Forth, I wrote a format
routine that would pick up a track and rewrite it with
interleaving of the sectors. It made enormous differences
in the operation of the hard sectored software. I'll try
to dig this stuff up. I'll try to give you a list of the
docs and such that I have as well. Maybe someone local can
scan stuff that that I don't have the time to deal with.
( I live in Santa Cruz Ca. ).
Later
 Dwight


PS I also modified my H-89 by mount two half height drives
in the single slot ( it did require a little filing of the plastic ).
Received on Fri Oct 27 2000 - 22:43:44 BST