Fix AIX PS/2 1.3 crashing with IBM PS/2 ESDI controller#6996
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Summary
Bit 5 of Device Configuration Status Block shifts too high, causing AIX PS/2 1.3 to crash.
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References
DASD Storage Interface Specification Micro Channel (REV 2.2): https://www.ardent-tool.com/docs/pdf/j_mcspec.pdf