Technical data

Power-Up Initialization Code, Continued
Table 2–1 (Continued) Power-Up Initialization Sequence
Stage What the System Does
5 Tests the serial lines. If this test fails, the console terminal is not enabled
and the only output is the HEX display.
If... And... Then...
No video option is
present
—– The system defaults to line
three of the serial port.
A video option is
plugged into the video
slot on the CPU and
the switch is set to
graphics
The test fails Video drivers are loaded and
the system behaves as if a
failure occurred.
The alternate console
switch is set to
alternate console
—– The terminal connected to line
three of the serial port is used
as the console.
6 Calls up the console device initialization routine. Console I/O is allowed
after this step. The system type and ROM ID are printed out at the console
device, followed by the amount of memory and the Ethernet address.
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