[sebhc] Improvements to the image transfer program

[Dwight K. Elvey]

Hi All
 I've sent in the latest image transfer code.
It is now H89LDR9.ZIP. The bootstrap code has
changed so that if you are using an older version,
you'll need to reenter the bootstrap code
from the monitor and after loading the main loader,
save it to your standalone floppy. The older
version will not work with the new one because
of an added command.
 I've also include a command at the PC to change
the baud rate for those that only have the
H8-5 to communicate through. The baud rate on the
H8's H8-5 is jumper selected so you'll need to
change the jumper to match the rate selected
on the PC side. This is to account for the fact
that may H8-5's do not work reliably at 9600
baud. The PC side can be set to 9600, 4800, 2400
or 1200. One of these will surely work.
 This command should not be used with the H89 or
H8 with H8-4. There is no easy way for both sides
to know what the baud rate is. The baud rate on
the H89 and H8-4 is set by software instead of
hardware. Both of these setups use rs232 level
drivers that should have no issues at 9600 Baud,
anyway.
 This code does have the added feature that it can
determine the volume number that is actually in
the sector headers of the disk. This is useful for
non-HDOS disk. Some require one to set the override
to match. For these disk, it is always a good idea
to save information as to what the volume number
of the disk is, if it is a non-HDOS. There are
256 possible volume numbers. It would be a pain
to have to try them all when restoring the image
to a disk.
Dwight


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