29 Apr
2013
29 Apr
'13
8:04 p.m.
Yes, it's possible to write a 360k disk in a 1.2MB
drive. See
http://www.classic-computers.org.nz/blog/2010-02-18-writing-cpm-from-1.2mb-…
Bulk-erasing before writing on a 96tpi and NOT re-writing on a 48tpi is a good tip,
and does work.
However (from the references web page):
A further tip: when writing new floppies with IMD (to
generate original Kaypro bundled
software for example), I found it easiest to Format the floppy under 22DISK first, as it
knows the correct settings for a Kaypro floppy, then use IMD to write to the formatted
floppy. Doing this meant the only setting I had to set on IMD is the Double Step (as I
have a 1.2MB (80 track) drive, not a 360KB (40 track) drive.
Makes no sense. IMD knows the exact format of the particular disk that it is writing
as this was determined at the time it was read, and is represented in the metadata
of the IMD file - it also formats the disk as it writes it, removing any previous
formatting.
And ... if he's writing on a 1.2M drive (presumed in a HD controller) , he WILL need
to
set a 250->300kbps translation in addition to double-stepping in order to write the
disks.
Dave
--
dave13 (at) Dave Dunfield
dunfield System/Firmware development services: www.dunfield.com
(dot) com Classic computers: http://www.classiccmp.org/dunfield
29 Apr
29 Apr
7:28 p.m.
On Mon, 29 Apr 2013, Dave Dunfield wrote:
Could part of the confusion there be that
SOME 1.2M drives are 360RPM only, and therefore require the 300kbps
data transfer rate, and
SOME 1.2M drive are 360RPM/300RPM, and when in a 300RPM mode can use the
250Kbps data transfer rate?
I can not tell from the original description whether he is having a
problem accessing the drives with the PC, using IMD, having 360K/1.2M
problems, or problems back on the Kaypro.
Using a DD drive on the PC would eliminate at least 1/4 of the
possibilities of what is going wrong.
AFTER getting a successful sequence of steps, THEN he can mess with the
additional issues of using 1.2M to write 360K.
(Yes, I am well aware that Kaypro has 200K/400K on their disks. "360K" is
the unambiquous term for such drives and diskettes.)
Good luck!
--
Grumpy Ol' Fred cisin at xenosoft.com
A further tip:
when writing new floppies with IMD (to generate original Kaypro bundled
software for example), I found it easiest to Format the floppy under 22DISK first, as it
knows the correct settings for a Kaypro floppy, then use IMD to write to the formatted
floppy. Doing this meant the only setting I had to set on IMD is the Double Step (as I
have a 1.2MB (80 track) drive, not a 360KB (40 track) drive.
Makes no sense. IMD
knows the exact format of the particular disk that it is writing
as this was determined at the time it was read, and is represented in the metadata
of the IMD file - it also formats the disk as it writes it, removing any previous
formatting.
And ... if he's writing on a 1.2M drive (presumed in a HD controller) , he WILL need
to
set a 250->300kbps translation in addition to double-stepping in order to write the
disks. 
7:29 p.m.
>A further tip: when writing new floppies with IMD
(to generate original
Kaypro bundled
>software for example), I found it easiest to Format
the floppy under
22DISK first, as it
>knows the correct settings for a Kaypro floppy,
then use IMD to write to
the formatted
>floppy. Doing this meant the only setting I had to
set on IMD is the
Double Step (as I
>have a 1.2MB (80 track) drive, not a 360KB (40
track) drive.
Makes no sense. IMD knows the exact format of the
particular disk that it
is writing
as this was determined at the time it was read, and is
represented in the
metadata
of the IMD file - it also formats the disk as it writes
it, removing any
previous formatting.
And ... if he's writing on a 1.2M drive (presumed
in a HD controller) , he
WILL need to
set a 250->300kbps translation in addition to
double-stepping in order to
write the disks.
Philip Avery is coming to see me this weekend. I'll ask him what prompted
him to write that.
Terry (Tez)
4035
days inactive
4035
days old
2 comments
3 participants
participants (3)
-
cisin＠xenosoft.com -
dave13＠dunfield.com -
terry＠webweavers.co.nz