11 Dec
2013
11 Dec
'13
2:12 a.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Glen Slick
Verzonden: woensdag 11 december 2013 2:30
Aan: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: Re: HP-150 Software
On Sat, Dec 7, 2013 at 10:18 AM, Chuck Guzis <cclist at sydex.com> wrote:
the
On 12/07/2013 09:18 AM, Robert Jarratt wrote:
Dave's TD02IMD.COM conversion utility fails with an error if any track on 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 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
IRC those are used as spare sector, in most cases not needed only when there
is a media error.
-Rik