Re: sun remarketing disk format

Great news!

I recall John mentioning these drives don't work with Lisa OS. Are they MacWorks only?

-J

On Fri, Jan 20, 2017 at 6:55 PM, James MacPhail <gg__at_email.domain.hidden> wrote:
>
> 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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-- 
Jason Perkins
313 355 0085

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