[Coco] mess HD problem

[Robert Gault]

Bill Nobel wrote:
> Hmm, Robert your post pointed out something I have wrong in my /DD descriptor.
 > Mine is currently set to $FFE0 and I’m using EmuDsk.  I do only use one vhd and
 > everything works good.  I now need to look at the source now to see if hpa is
 > even used.
>
> Bill Nobel
>

It is not used. :(

When Alan wrote emudsk, there wasn't a need to check the descriptor for 
anything. The size of the OS-9 .vhd section was hard coded to $5A000 and only 
one .vhd image was used. That meant the I/O port could also be hard coded.

With the advent of a second .vhd drive, I had the code check the descriptor for 
the drive number 0 or 1.

The version of emudsk on Sourceforge will not work with the second .vhd drive in 
the JVC emulator because there is no code for the $FF80 set of I/O ports.
That would not be difficult as you could use a register to point to the port 
base instead of using extended addressing. When switching drives, you would 
alter the register by $60; $FF80+$60=$FFE0.

Robert