[Coco] 6309 microproccessor project - 11-06-2003

[Stephen H. Fischer]

Hi,

----- Original Message ----- 

From: "Roger Taylor" <rtaylor at bayou.com>

To: <coco at maltedmedia.com>

Sent: Thursday, November 06, 2003 4:14 PM

Subject: Re: [Coco] 6309 microproccessor project - 11-06-2003



> At 01:10 PM 11/6/2003 -0500, you wrote:

> >6309 microprocessor project.

> >

> >Hello,

> >

> >Since the emulator memory model follows Paul Barton's NoCan 32MB/64MB

> >interface and it uses the MMU extension registers located at $FF80-$FF8F

> >along with the MMU registers at $FFA0-$FFAF I'll have to move the
emulator

> >vhd interface from $FF80-$FF85 to somewhere else. I was thinking about
the

> >area right after the PIA's. It looks like this area might be free?

> >

> >$FF04 RMB 28 PIA0 IMAGES

> >$FF24 RMB 28 PIA1 IMAGES

>

> I suppose since it's only a Virtual Hard Drive interface, only for the

> emulator, that it wouldn't be that bad of an idea, especially since OS-9

> can be configured so easily. But watch out for real CoCo programs that

> might just happen to use some device that maps in there...

>

>

> >I can actually have 2 vhd interfaces easily fit into either area. The

> >reason for 2 vhd interfaces is I felt the need to backup my emulated hard

> >drive already. If anyone can shed light on this please respond. If it

>

> c:\copy original.vhd backup.vhd

>

> :)

>

Actually the addition of a second "vhd" may be very useful!

I do not know how it happened, but John Collyer's hard drive (On RTSI) has a
error within it, similar to other errors I have seen on real floppies.

A second "vhd" would be very useful to correct any errors that might appear
(DED work) and for copying to do a reorganization of the folder structure.

Without a second "vhd" faking HD's can be done by changing one of the floppy
descriptors to 255 Tracks, 255 Sectors, 2 Sides.

OT: Are there others beside me that are getting authorization requests from
gmane and ignoring them?
Gmane has only part of the messages on the list I suspect.

Stephen H. Fischer <sfischer1 at mindspring.com>

>

> Also, virtual floppy disks are cheaper than dirt these days!.....

>

> c:\copy blankSS35.dsk newSS35.dsk

>

> cheers

>

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