[Coco] Help with Jeff V. Coco3 dos emulator

[Robert Gault]

I've found another problem with Coco3 JVC vs MESS or VCC. The JVC emulator does 
not like DD.FMT 3 with double sided disks. Change that byte from 3 to 2 and you 
can boot the disks with another caveat.

The JVC emulator does not treat double sided disks the way MESS and VCC do. It 
will not automatically compensate for alternate tracks and can't find T34. Using 
Disk Basic 1.1 with this emulator, you will want to
POKE &HDF1C,68:DOS
to get double sided disks to boot.

If you want to use RGBDOS with this emulator, don't bother with the POKE (which 
needs a different location) just create a single sided disk for a .vhd drive and 
boot that way.

Robert