HP C737990900 - Manual (Page 120)

120 Commands
If other invalid pages are requested, CHECK CONDITION will result with status
of ILLEGAL REQUEST and additional sense of 2601h, “parameter not
supported”.
Data Returned
Page Code 70h — Self-Test (Read/Write)
Page Format for Write:
No parameters are needed. Sending this page is equivalent to a Send
Diagnostic command with both the SelfTest and UnitOfl bits set.
Page Format for Read:
7 6 5 4 3 2 1 0
0 Page Code (70h)
1 Reserved (0)
2 (MSB)
Parameter List Length (0)
3 (LSB)
7 6 5 4 3 2 1 0
0 Page Code (70h)
1 Reserved (0)
2 (MSB)
Parameter List Length (4)
3 (LSB)
4 (MSB)
Error Code
7 (LSB)