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ERROR MESSAGES
28.4 -- System
Er~or
Status Word
F E D
C
B
A
9 8 7
6
5
4 3 2
1
0
Errol"
St.atu~
Error
Mask
Error Type
Bits 0-7 descl'ibe
erT'or
ErT'or Mask Flag
Bit B (8-A
unu~ed)
Error Status
Flag
Bit F (C-E unused)
Normally,
after
the
completion or each command all bits of
the ErT'or Status and the Error Type are cleared
(=
0).
If an
e1''I''or oc c ur'l"ed d ur
i
ng th e command
I
th e Error Status Flag (b i t
F)
~ill
be set by the command.
In addition,
an
Errol'
Type
~ill
be
set
into
the
lower half of the status word (bits
0-7),
The Erl"or Type is used to
indica.te
which
erl'or
was
detected
by
the command.
Usually,
the CHAIN p'I"ocess will aboT't anytime the Error
Status Flag is set by one of the commands
invoked
rrom
the
intermediate
file;
however,
the
ErT'or Mask can be used to
inhibit CHAIN process aborting due to
command
errors.
The
Error
Mask
Flag (bit B) will inhibit CHAIN process aborting
if it is set to one.
The process of setting the
Error
Mask
is descl"ibed in section 6.4.
28.5 Commands Affecting ErT'oT' Status Worti
All MDOS commands that are intended
~o
be invoked
by
the
CHAIN process have been programmed to configul"e
er~or
t~pes
into
the
system
error
status word.
These error types are
summarized
here
to
racilitate
the
user
who
is
taking
advantage
of
the
TST
execution
operator during the ·CHAIN
proc ess.
All MDOS commands use the
system
function
.MDERR
for
displaying
the common e,..,..or messages.
Thusl the error types
that correspond to these messages will always
be
the
samei
namely,
the
error
message's
index number used to call the
MDERR function (not the same as
the
displa~ed,
two-digiti
error message reference number); however,
commands have other
error messages that are displayed independently of the .MDERR
runction.
These errors will cause a value to be set into the
Error Type field of the error status
word
that
is
greater
J
than
or
equal
to 128 ($80).
It is these values, which are
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