17 Jun
2006
17 Jun
'06
8:54 p.m.
>The 360K floppy I have, only has the drive select
jumpers. I've tried
>changing the DBT and using Int 13 but it is still not working. I guess
>I'll just have to live with it. It is working, it is just that when the
>1.44M goes>to another track, I have to recal the 360K drive...
On Sat, 17 Jun 2006, Chuck Guzis wrote:
Does your 360K drive have the terminator installed?
If not, have you tried
it with the terminator? (you don't need to use the standard 150 ohm ones;
1K should be good enough).
Check pin 34 of the drive. Is it using it for "Disk Change", or for
"READY"?
Use Int 1Eh to point to a new parameter table, copied from the old one.
Insert some code to check whether 1E is still pointing to your table after
a floppy access.
Insert some code to check the validity of your table after a floppy access.
Point 1E back to where it was, afterwards.
Check the behavior under DOS 2.10 (which has the absolutely slowest
default step rates (to work with the Qume 142))
What else can be narrowed down as occurring when you get the recals?
(several other kinds of floppy errors could result in a recal.)
Can you assume that everyone will have 640K?
You COULD read the image into RAM, to avoid any switching of floppies.