Advertisement
CHAIN COMMAND
6.4 -- Execution Operators
commercial at-sign
(@)
as the first character of a line.
Any
number
of
intervening spaces (including none) can
be
placed
between the at-sign and the
o~~rator.
If
an
operator
is
found
which
is
not
defined,
the
CHAIN
process
will be
aborted.
The following Execution Operators are derined:
Operator
Function
Comment
Operator breakpoint
Set error status word
Test error status word
SET
TST
~MP
LBL
CMD
Continue
se~uential
processing at label
Define a label
Change state of CHAIN input echo
6. 4. 1 E
x e
C
fJ
t i
on
C
g
mme
n
t
s
If the character following the at-Sign
is
an
asterisk
(*)1
then
an Execution Comment is indicated.
The i"'emainder
oT the line following
the
asterisk
contains
the
commentJ
which
can
include
any
displayable
characters.
Execution
Comments are compiled into the intermediate file and are
not
displaqed
until
they
are
encountered during the execution
phase.
Execution Comments are used to relay
information
to
the
operator during the actual execution of the intermediate
file.
In conjunction
with
the
Operator
Breakpoint
(next
section»)
these
comments
also
serve as a means of passing
instructions to the operator
for
mounting
paper
into
the
pr inter
I
swap ping
dis
Ie
ettes
in
dr
i
yes one}
tWOl
or three,
loading a cassette, etc.
6.4.2 Operator Breakpoints
A variation of the Execution
Comment
is
the
Operator
Breakpoint.
Ir
a period (., is used instead of an asterisk
for the Execution Comment, then the normal Execution
Comment
is
displayed;
however,
instead
of
c~ntinuing
with
the
processing of the next line of the intermediate rile,
the BEL
($07) character is sent to the console to alert the operator.
Th e CHAIN proc ess th en wa i ts for any key on .th
e
key board
to
be
depressed
before continuing.
For example, the following
compiled CHAIN file:
@*
GOING TO ASSEMBLE PROGRAM
@.
TURN
ON PRINTER
RASM TESTPROGiLXG
would display the two comments during the
execution
of
the
CHAIN
process.
Prior to starting the assembly,
however, the
CHAIN process would pause allowing the operator time to ready
Page
06-09
Advertisement
