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ERRo.RS AND PROGRAM HALTS IN
COMPATIBILITY MODE
•
A common lllicro-program halt routine
is used to display IJ, LT and a
coded byte in the R-register to
indicate the cause of an error.
A common stop routine is micro pro-
grammed to handle all stops in compat-
ibility mode that can be brought to a
stop through micro programming.
This
routine accomplishes the following:
1.
Stores the address registers along
with the D-, G-, and S- register in
their local storage backup
locations.
2.
Converts all addresses to the
form:
N
r-------T-------T--------T----~----l
14bits
I
4bits
I
4bits
t
4bits
I
11
1 2 1 3
1 4
I
l _______
~
_____
~
_______
~
________ J
Where 1 denotes the thousands posi-
of a 1400 system address in binary.
Where 2 denotes the hundreds posi-
tion of a 1400 system address in
decimal.
Where 3 denotes the tens position of
a 1400 system address in decimal.
Where 4 denotes the units position
of a 1400 system address in decimal.
3.
Displays the converted
IJ
address in
the MN lights.
4.
Displays the converted LT address in
the B- and A- register lights.
5.
Displays a coded byte in the R-
register lights which indicates the
cause of a stop to the operator.
The stop routine does not run invalid
addresses through the conversion
routine.
However, it does display the
addresses in their binary form, so the
CE can inspect their contents to
diagnose the error.
The coded byte displayed in the
R-
register lights is backed up in byte KO
of MPX 1 storage before the 2030 stops
(Figure 5-22).
5-45
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