H89 disk imaging

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Tue Jul 27 19:02:46 2004

>From: "Dan Lanciani" <ddl_at_danlan.com>
>
>Did you ever get this going? I'm looking at a different approach, reading
>the single density disks a track at a time in double density and then doing
>the data separation in software.
>
> Dan
>

Hi Dan
 Unless you know something I don't about disk formats, you
can not read double single density format with a double
density controller. It isn't that you'll just get 16 bits
instead of 8 bits, things like sync makers will not work.

 In any case, I currently have a method of transferring
hard sectored 40 track disk images to and from the following
platforms to a PC running DOS:

Z/H90 w/ serial card
H89 w/ serial card
H8 w/ H8-5 serial/cassette card
H8 w/ H8-4 serial card
  ( Note: The H8's may be either an 8080 w/ PAM8 or a Z80 w/ XCON8 ).

 The DOS machine needs a serial port.
 My setup can also be used to bootstrap a machine that one
has no access to disk with code on them. You only need the
blank disks to copy the images to to bring up a system.
Dwight

ps I hope Dan is on our mail list because I no longer email
 directly to queries from off list. See my previous post.
 
Received on Tue Jul 27 2004 - 19:02:46 BST