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dc42 images and known good checksums

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jamesdenton:
With dc42 images floating around in various working and non-working states, I was curious to know if anyone has compiled a list of (md5?) checksums for known-working dc42 images. This would avoid a copy operation and subsequent failure, and maybe even help reconcile images of varying names to an exact disk. I'm mainly concerned about the legit Apple install media versus random images. Does something like this exist already and, if not, would it be of any use to anyone besides me?

sigma7:

--- Quote from: jamesdenton on April 15, 2025, 09:52:16 pm ---would it be of any use?

--- End quote ---

Yes, I think it would be useful.

My initial inclination would be to md5 only the data (exclude the tags), and to skip the DC42 header.

Further, the catalog would store the value for the ultimately uncompressed data/result (so the md5 value would be the same for a disk image encoded as binary, dc42, zip, sit etc.).

Perhaps two values should be stored, one for the above, and one for the file as-is (including tags and DC42 header after zipping or whatever).

sigma7:

--- Quote from: jamesdenton on April 15, 2025, 09:52:16 pm ---With dc42 images floating around in various working and non-working states

--- End quote ---

Since we recently had an issue with suspected corruption of ROM images on bitsavers, perhaps the reference catalog could include more than just disk images?

ie. also ROM images, including CPU, I/O, expansion boards, P6A & video PROMs, COPS, Widget & ProFile firmware...

TorZidan:

A thought: instead of collecting checksums of working dc42 image files, why not collect the files themselves? A curated file server with files that have been verified  and confirmed by someone that they work, and perhaps accompanied with installation instructions, hardware specs /emulator specs used for validating.

From my personal experience, most standard Lisa software out there works just fine in LisaEm, meaning that these floppy images are good.
The one thing I found not working was the dc42 image for Lisa Monitor 11.2 (all copies floating around on the web do not boot in LisaEm). But that's fine: there are so many other Lisa Monitor versions, and they work fine.

 

blusnowkitty:
Start posting MD5s of your DC42s, and I'll start getting them linked into the Apple Lisa Software Release document.

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