[Coco] mess HD problem

[Bob Devries]

Hi Bill,

If the hpa setting isn't used, then I'm at a loss to explain why 
"correcting" that setting in my DD descriptor has made the problem go away.

Regards, Bob Devries
Dalby, QLD, Australia

On 7/08/2014 12:22 PM, Bill Nobel wrote:
> Yep I thought so emudsk itself doesn’t touch hpa from the descriptor at all, it’s hard coded for $FF8x,  so that won’t make a difference for Bob’s problem, unless he isn’t using emudsk.
>
> Bill Nobel
>
>> On Aug 6, 2014, at 7:00 PM, Bill Nobel <b_nobel at hotmail.com> 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
>>
>>> On Aug 6, 2014, at 5:09 PM, Robert Gault <robert.gault at att.net> wrote:
>>>
>>> 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)
>>>
>>>
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>