Anyone have a listing of shows coming up in the NY/NJ/CT area...
Anything for computers and/or videogames...
I would like to see about getting a vendor table to sell copies of the
Atari Inc. book and to also sell my USB joysticks and my newer versions
that are ready May 1st.
Thanks.
Curt
>Booted to DOS 5.0, on AT class machine, drive B set to 1.2MB, formats
>and writes/reads disks fine. imd has been copied to HD, as well as IMD
>image.
>>
>> If you are booting to real/raw DOS ... does the drive work under DOS.?
>Yes
>> Can you FORMAT 1.2M and 360k disks under DOS and read/write
>> them.? If not, you have a hardware problem (for DOS, make sure it is
>> configured correctly in BIOS - IMD doesn't use BIOS settings though).
>Works fine
When you create 360/1.2M disks by formatting on the PC - can you then
read and recreate those disks with IMD?
If yes, then likely your hardware setup is working. If no, then you may have
some compatibility issue with the mainboard controller. (IMD does direct
access to the FDC hardware)
Fred's post below also reminded me that Kay disks are 10x512 - this can
be "a bit tight" for some PC controllers. 765's and derivitives have a "blind
spot" just after the index hole - and some versions are worse than others.
Once you try to recreate a Kay disk and it fails ... try reading the first track
back. Does it get most of the sectors. If the first or last sector is missing,
then it likely held off writing the first sector long enough that the whole track
with the "extra" sector didn't fit in the remainder of the track.
If this happens, you could try slowing the drive down slightly ... you may be
able to create a readable disk that way (I almost always have to slow my
drives by a few rpm to write Cromemco disks for example). You might also
make readable disks by reducing the gaps from the precalculated values..
a little experimentation may be in order.
IIRC you indicated that you were using a Teac 1.2M drive - it might be
jumperable for 300rpm ... if so, try that - running the controller at 250kbps
might improve the situation. I find that generally recreating DD disks can
be a little more forgiving with 300rpm drives.
Dave
--
dave13 (at) Dave Dunfield
dunfield System/Firmware development services: www.dunfield.com
(dot) com Classic computers: http://www.classiccmp.org/dunfield
>> >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.
>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?
Is there a "standard" for setting drive speed? - I don't think I've encountered an actual
dual speed HD drive setup in a PC (except for some of mine which have a manual
"speed switch" on the front panel added by yours truly :-). IMD doesn't know anything
about changing the drive speed as I have not seen documentation on this so if this is
possible on some drives/controllers, then it might explain it - if 22disk had changed the
speed of the drive.
Dave
--
dave13 (at) Dave Dunfield
dunfield System/Firmware development services: www.dunfield.com
(dot) com Classic computers: http://www.classiccmp.org/dunfield
