IBM 6C1, Service Manual

Page: 121 / 377

Table 2. Firmware Checkpoints. (continued)
Checkpoint Description Action/ Possible Failing FRU
E1DB Create a (floppy) diskette controller
(FDC) node. Go to MAP 1540: Minimum
Configuration, “Step 1540-24” on
page 81.
E1DC Dynamic console selection. If a console is attached but nothing is
displayed on it, follow the steps
associated with
″
All display problems
″
in
the Entry MAP tables.
If selection screen(s) can be seen on
the terminals and the appropriate key
on the input device associated with the
desired display or terminal is pressed,
within 60 seconds, but there is no
response to the keystroke:
1. If selecting the console with a
keyboard attached to the system,
replace the keyboard. If replacing
the keyboard does not fix the
problem, replace the system board.
Location: P1
(See notes on page 115.)
2. If selecting the console with an
ASCII terminal, suspect the ASCII
terminal. Use the problem
determination procedures for the
terminal. If these procedures do not
reveal a problem, replace the
system board.
Location: P1
Note: Terminal settings should be
set to:
v
9600 Baud
v
No Parity
v
8 Data bits
v
1 Stop bit
E1DD Early processor exception See “Unresolved Checkpoint Problems”
on page 85.
E1DE Alternating pattern of E1DE and E1AD
is used to indicate a default catch
condition before the firmware
″
checkpoint
″
word is available.
Go to MAP 1540: Minimum
Configuration, “Step 1540-24” on
page 81.
E1DF Create diskette drive (disk) node Go to MAP 1540: Minimum
Configuration, “Step 1540-24” on
page 81.
E1E0 Program flash See “Unresolved Checkpoint Problems”
on page 85.
Chapter 4. Checkpoints
103