Xerox 1186 User Manual page 18

INTRODUCTION
10
Error codes are indications of problems in the
program you are attempting to run. Codes less
than 9000 are displayed by non-Lisp systems (e.g.,
the booting programs), while codes in the range
9000-9999 an? displayed while Lisp is running. Error
codes usually indicate serious errors, as most minor
errors during Lisp operation are handled within the
Interlisp-D Break Package. Thus an error code
generally indicates a software error in a part of the
system where it would be dangerous to signal a
normal Lisp error.
When Lisp encounters such an error, it halts,
displays a cursor code indicating the type of error,
and waits for you to take some action. You have a
choice of two actions: (1) you can press the UNDO
key, which calls a debugging program called
TeleRaid (a Ubrary Module); from which it is
possible to inspect the halted machine's state from
another (network connected) workstation; or (2)
you can press the STOP key, in which case the system
attempts a "Hard Reset", which dears the state of
any active computation and restarts all processes
from the top.
If the failure persists, please note the cursor code
and notify Xerox AISupport. It is also helpful to
gather additional information by running TeleRaid.
Occasionally there are fundamental problems
during booting signaled by a combination of red
lights above the boot button.
Refer to chapter 7, Diagnostics for more
information about error codes and boot lights.
XEROX 1186 USER'S GUIDE