10 Dec
2013
10 Dec
'13
5:29 p.m.
On Sat, Dec 7, 2013 at 10:18 AM, Chuck Guzis <cclist at sydex.com> wrote:
On 12/07/2013 09:18 AM, Robert Jarratt wrote:
Dave's TD02IMD.COM conversion utility fails with an error if any track
on the disk contains sectors of unequal size, with the reason being
that a PC 765 floppy disk controller cannot format such tracks. (I'll
take Dave's word in his documents that is true).
For example, the SYSMASTA.TD0 and APPMASTR.TD0 files contained here
have this issue:
http://www.hpmuseum.net/software/SYSMASTA.zip
These Teledisk images have 16 256-byte sectors per track, sectors
0-15, plus one 128-byte sector per track, sector 17.
Anyone know what is going on with these extra sectors here for these
HP-150 Teledisk images? Is there any valid and necessary data in
these sectors, or are they extraneous garbage? And if they are
garbage, how and why did they get there?
I ran into the same issue with some HP-85 series Teledisk images from
the HP Museum website and I created physical floppy disks after
ignoring and discarding the extra 128-byte sector 17 in each image
track. The resulting physical floppies appeared to function
correctly.
-Glen
Sorry I forgot to mention that I tried that and
it failed with an error
about different sector sizes on the same track.
If you need it, I think I have a program here that will dump a TD0 to a pure
binary file. I don't know if that will help you out or not.
But I've used Dave's IMD utility to convert from TD0 to IMD files on other
formats.
--Chuck