[Coco] Load .vhd image into Drivewire3

[Earl Casper]

On Fri, Apr 27, 2012 at 7:12 PM, Robert Gault <robert.gault at att.net> wrote:

> Earl Casper wrote:
>
>> How do you load a virtual hard drive image into Drivewire3?
>>
>>
> Perhaps you meant to ask, how do you use a .vhd image with DW3, which is a
> different issue. The Disk Basic offset value in the HDBDOS rom MUST match
> the offset in the .vhd image. If there is a match, then you can use the
> .vhd image exactly as you would in MESS, VCC, or a real Coco with a hard
> drive.
> If the offset values do not match, then you are stuck unless you are using
> a Coco3 or can burn an alternate EPROM.
>
> With a Coco3, you can just POKE into memory the required offset value so
> that the EPROM matches the .vhd image. The default value for .vhd images is
> $5A000 bytes to the beginning of the Disk Basic section.
> POKE&HD938,5:POKE&HD939,&HA0 with a Coco3 will make the ROM match the
> default .vhd format.
>
>
Of course to get Drivewire3 back to reading .dsk images you need to poke
those locations with 0's