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dc42 images and known good checksums

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ried:
Thank you for creating that document. Very helpful! I have a set of BPI Accounting System disks that I've been meaning to archive and make available. Similarly, a friend has come across a bundle of three Twiggy disks for a previously unknown (?) LOS app called Tekalike by Mesa Graphics, dated 1984. Seems to be a terminal graphic program of some sort, and will be shared after I receive them for archiving.

blusnowkitty:

--- Quote from: ried on April 17, 2025, 09:58:24 am ---Similarly, a friend has come across a bundle of three Twiggy disks for a previously unknown (?) LOS app called Tekalike by Mesa Graphics, dated 1984. Seems to be a terminal graphic program of some sort, and will be shared after I receive them for archiving.

--- End quote ---

Good find, I'm interested to see it in action - it looks like my first thought was correct, this is a Tektronics 4010/4050 graphics terminal emulator program that appears to have gotten ported over to the Mac later in life: https://books.google.com/books?id=zC4EAAAAMBAJ&pg=PA46&dq=%22tekalike%22+mesa+graphics&hl=en&sa=X&ved=2ahUKEwib8fPSnt-MAxXkRTABHZemF_wQ6AF6BAgIEAM#v=onepage&q=%22tekalike%22%20mesa%20graphics&f=false


I also found some snippets on Google Books implying that Tekalike did actually ship for Lisa... the dealer pamphlet also says Mesa Graphics was writing software for Lisa in 1983, think this is what they were writing? http://www.bitsavers.org/pdf/apple/lisa/marketing/Lisa_Dealer_Presentation_1983.pdf

stepleton:

--- Quote from: ried on April 17, 2025, 09:58:24 am ---LOS app called Tekalike by Mesa Graphics, dated 1984. Seems to be a terminal graphic program of some sort, and will be shared after I receive them for archiving.
--- End quote ---

Oh I can't wait --- this is highly relevant to some of my other retrocomputing interests:

https://github.com/stepleton/hpgl2tek
https://github.com/stepleton/mupas/tree/main/examples/fourspite
https://github.com/stepleton/mupas/tree/main/examples/perplex
https://www.youtube.com/watch?v=ind_2eMzsbM
https://www.youtube.com/watch?v=3Gm0Cl54dZY

sigma7:

--- Quote from: blusnowkitty on April 17, 2025, 09:44:40 am ---Start posting MD5s of your DC42s

--- End quote ---

BLU 0.10
MD5 (BLU010.dc42) = fd526ea9e045d2024f832c45b7929d29

Xenix 2.3 Twiggies
MD5 (Xenix1of5.dc42) = 1fac4eafbc3567bc50ef5f3a826581d3
MD5 (Xenix2of5.dc42) = 003b436f821c715e57c0ec8d5d61f2fc
MD5 (Xenix3of5.dc42) = 40f71ac5d01e625d384ef51c23362452
MD5 (Xenix4of5.dc42) = 59bdcf071539b610032cb119d9e9f1ea
MD5 (Xenix5of5.dc42) = 40682b206e02b38b3759ad750ac36c28

Modified for X/ProFile per http://sigmasevensystems.com/xpf_xenix.html
MD5 (Xenix1of5Mod.dc42) = fda0c629208de4d812c06878c20cab5b
MD5 (Xenix2of5Mod.dc42) = a7da78e7eff741b473c05903a1b78cba

The Xenix images checksummed above were created with BLU 0.07 (which appears in the DC42 header), so another image of the same disk with a different version of BLU will have a different MD5.
Hence the suggestion to MD5 only the data portion of the DC42, eg:

hexdump -v -e '"%X"' -s 84 -n 871424 Xenix1of5.dc42 | md5 = 1c5935aa5eb3aec6b32d160a2349d97d
hexdump -v -e '"%X"' -s 84 -n 871424 Xenix2of5.dc42 | md5 = e3ab77488bb12de3ecd68fb0e9d56d32
hexdump -v -e '"%X"' -s 84 -n 871424 Xenix3of5.dc42 | md5 = 4fe11fefe374e319b1a0552f0e190202
hexdump -v -e '"%X"' -s 84 -n 871424 Xenix4of5.dc42 | md5 = 90251cf641728321277f3b15ce0b948c
hexdump -v -e '"%X"' -s 84 -n 871424 Xenix5of5.dc42 | md5 = 6dfac516dc2b0ddd49ab01ad939478ca

where "-s 84" skips the first 0x54 bytes (the DC42 header) and "-n 871424" considers only the 0xd4c00 bytes of data (excluding the tags).
the md5 is performed on the hexdump, which I used only for the convenience of it having -s and -n parameters.

The decimal number of data bytes in a non-sparse DC42 image are
Twiggy 871424
400k 409600
800k 819200

edit: added hexdump suggestion example

blusnowkitty:
When did XENIX 2.3 show up?

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