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The world has a running Rational R1000/400 computer again (2019)
Logbook/2019 2019-12-11 SCSI command 0x0d seems to be explained now: Søren Roug has spotted SASI command 0x0d in the manual for the Xebec S1410 diskcontroller: It returns the length of burst errors corrected with ECC. That matches the CMD_CORRECTION Tollef found.
My good friend Tollef Fog Heen replied on twitter that this source file on github calls the command CMD_CORRECTION. Conclusion: The IOC bootstrap uses "modern SCSI" with linear block-numbers, the real system works in terms of Cylinders, Heads and Sectors. During power-off, these lights turned for a very short period, indicating the PSU is capable but unwilling (Inhibit line active?).
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