HP C737990900 Technical Reference Manual page 114

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114 Commands
7 6
(MSB)
The format of the 4-byte Echo buffer descriptor for Mode 01011b is as follows:
7 6
(MSB)
5 4 3
Buffer Capacity
5 4 3
Reserved (0)
Echo Buffer Size (1000h)
2 1 0
(LSB)
2 1 0
EBOS (1)
(LSB)