IBM System/370 145 Operating Procedures Manual page 43

POWER-ON PROCEDURES
Channel-to-Channel Adapter (CTCA) Feature Installed
1
Press the POWE R ON key.
Pressing the POWER-ON key initiates a power-on
sequence for the CPU and on-line I/O units. The key
turns red when pressed and turns white when the power-
on sequence is complete. The time required for a power-
on sequence is determined by the number and type of
I/O units on-line. The contents of storage is not valid
after a power-on sequence. Also, an IMPL operation is
required. (The IMPL is automatic if the rotary switches
are in their normal processing positions, the ADDRESS
COMPARE CONTROL switch is set to SYNC/NORM,
and the *370 microprogram disk is mounted on the
console file.)
2
Wait for the I/O INFC DSBLD indicator to turn on.
3
Move the I/O INTERFACE switch to the ENABLE position.
42
When the I/O INFC DSBLD indicator turns off the adapter
is available to the program.
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