Archival preservation of software

Gordon JC Pearce gordonjcp at
Mon Oct 22 03:59:56 CDT 2007

On Sunday 21 October 2007 11:26:04 Ethan Dicks wrote:

> I'll be curious to hear about any future progress.  I, too, have a
> Mirage, and a box of sample disks, but I don't know if I have any
> utility disks.

If you grab the SQ80 utilities from then you can adapt them to 
read the Mirage's single-sided disks (it's just a case of commenting out the 
bit that toggles the "side select" and making it not loop over side 0/side 
1/) and get usable images.  I haven't tried writing them back to formatted 
disks yet.

There is an application that runs under DOS that will format SQ80 disks, which 
work just fine in the Mirage - it will cheerfully ignore side 1, even though 
many of them have DSDD drives - but it's a PITA to find a machine to install 
DOS on just for one thing.  It must be possible, therefore, to format the 
disks on a PC controller.  I know the Mirage uses a WD1772 controller.

I suspect that the formatter needs to write some "magic bits" to the directory 
block before the Mirage will actually talk to the disk.  Using the Geibler 
utility I can format a disk but I need to write an image to it before I can 
save anything.


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