Re: sun remarketing disk format

I contacted John Woodall of Vintage Micros (who bought Sun Remarketing's Lisa hardware and intellectual property when they went out of business), and he has agreed to release/donate the source code for the Sun controller.

I'll send it to Al for publication on BitSavers once it has been found.

James

>I managed to read some tracks from a Kalok MFM drive, and Dave
>Gesswein decoded the format
>
>The drive controller has rev C firmware, and uses a board that looks
>more integrated than the
>pictures of the one on bitsavers, so I uploaded the firmware and
>those pictures. Interesting that
>the drive apparently has two cylinder 0's.
>
>I'll make another attempt at reading my drive later today.
>
>It would be nice to add firmware disassemblies to the stuff on bitsavers.
>
>
>from Dave:
>
>
>Code up in testing if you wish to try. In looking further its not seek
>error, they are being really irritating. The drive has two cylinder 0's.
>On the first read it isn't interleaved and after the seek it is interleaved.
>My code doesn't have much hope of handling that cleanly.
>Head 1-3 on the first cylinder 0 look like they aren't formatted the same
>as zero.
>
>Try reading with
>--sectors 17,0 --heads 4 --cylinders 615 --header_crc
>0x2605fb9c,0x104c981,32,5 --data_crc 0x84a36c27,0x104c981,32,5
>--format OMTI_5510 --sector_length 532 --retries 50,4 --drive 1
>
>without --ignore_seek_errors it should read the first cyl 0 then
>see the second and assume a seek error and move on to cyl 1/2.
>
>With --ignore_seek_errors it will overwrite the first cyl 0 with the second
>and ignore mismatches between the expected cylinder and actual. Data will
>be written to cylinder read from header.
>
>You can change the ,5 to ,11 on the crc to increase the ECC to 11 bits to
>try to recover more sectors. OMTI said 5 bit correct but others have
>said 11 bit with 32 bit ECC. Larger number increases chance of miscorrect.
>
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