[Coco] mess HD problem

[Robert Gault]

Bob Devries wrote:
> Hi all,
>
> well, changing the port address to $FF80 appears to have fixed the problem.
>
> I don't know how I came by a module with the incorrect hpa. Could it be that a
> previous version of emudsk used that address?
>
> Thanks for your input everyone.
>
> Regards, Bob Devries
> Dalby, QLD, Australia
>

Bob,

Here is some info.

*Technical specs on Virtual Hard Disk interface Alan DeKok: JVC, MESS and VCC

*	Address       Description
*	-------       -----------
*	FF80          Logical record number (high byte)
*	FF81          Logical record number (middle byte)
*	FF82          Logical record number (low byte)
*	FF83          Command/status register
*	FF84          Buffer address (high byte)
*	FF85          Buffer address (low byte)
*       FF86          DR# 0=first drive 1=second drive; MESS only

Look at MESS/SRC/machine/coco_vhd.c

-----------------------------------------------------------------------------
*	The JV Coco3x has 2 .vhd drives with the second address set as:
*	Address       Description
*	-------       -----------
*	FFE0          Logical record number (high byte)
*	FFE1          Logical record number (middle byte)
*	FFE2          Logical record number (low byte)
*	FFE3          Command/status register
*	FFE4          Buffer address (high byte)
*	FFE5          Buffer address (low byte)