HP 8753E User Manual page 611

Information You have instructed the analyzer to use pass control (USEPASC). When you
Message send the analyzer an instruction that requires active controller mode, the
analyzer requests control of the bus and simultaneously displays this message.
If the message remains, the system controller is not relinquishing the bus.
Error Number You have sent the data header "#A" to the analyzer with no preceding input
32
command (such as INPUDATA). The instrument recognized the header but did
not know what type of data to receive. Refer to the HP87533
information.
Error Number You have attempted to store, load, or read file titles, but your disk format does
77
not conform to the Logical Interchange Format (LB') or DOS format. You must
initialize the disk before reading or writing to it.
Network
for command syntax
Error Messages 1 O-27