IBM 5256-1 Maintenance Information Manual page 90

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Page 1-72
Controller acknowledges
power on transition
status response to a poll
command
Acknowledgement is in
the next 'poll' command
Successful host system
communications is
establ ished
The 5256 Printer is now
online and is available
for printing
Wiring Diagram,
Diagnostic Aids
Maintenance 5256 MIM 1-73