IBM 3151 User Manual page 124

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Reference Information (SYSTEM A IT ACH)
Usage Note
This command takes approximately 500 ms to be processed. Specify a 500 ms
interval before issuing the next command.
Machine modes are classified into five groups; IBM 3151, IBM 3101, ten ASCII
terminals. DEC VT220, and SYSTEM ATTACH. If the machine mode is
changed to a new machine mode in a different group, setup-value definitions that
are in use are replaced with the ones for the new machine modes and the
power-on reset (except the checking of the internal circuits) is performed .
Chapter 5. Reference Information
5-15