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tified by alpha characters on the left
(F igure 3-2 0) •
Line One-Partial and Actual:
The actual
address is in 4-digit hexadecimal nota-
tion.
The partial address,
11,
is the
low-order two bits of the actual
address,08A3.
Line Two (E.)-Emitted Value and Mode:
This line is used if the CK field is
used to emit a constant.
The mode of
the data is shown.
Figure 3-20 shows
the CK field to have the value of 5 and
the mode of the data specified is deci-
mal.
Line Three (A)-The Arithmetic Statement:
This line is used for all arithmetic
statements.
An example is R
+
D->L.
This statement adds the contents of the
D-register to the R-register data and
the result is stored in the L-register.
Line Four (S}-Storage Control:
This
line specifies the core-storage area
being used and the operation desired.
The expression IJ->MN MS gives a read
call to Main Storage (MS) addressed by
IJ.
Line Five
(C)
-Status or Test Controls:
This line is mainly used for setting and
resetting the bits of the S-register.
The expression 0->54, 55 resets both 54
and 55 to zero.
Line Six
m
Top)-ROS Controls:
This
line has cont.rol of statements pertain-
ingto the W-register and some test
statements.
The expression K->W sets
the W-register to a value determined by
the CK field.
This value is specified
on the E line of the CLD box.
Line Seven (R)-ROS Branch:
'Ibis line
cheCKS conditions which determine the X6
and Xl positions for branching. Branch-
ing occurs, dependent on
GO
and
Gl.
If
GO
and
Gl
are both set to one, a 1, 1
branch is taken.
Line Eight (Print
Position and Block Serial Number): The
location (AS), on a CAS sbeet, of this
specific ROS word is shown on the bottom
left.
The block serial number (BB) is
on the right.
This number (BB) remains
the same regardless of the location of
the word on the page.
A group of ROS words in box form
written on one sheet is commonly called
a CAS logic diagram (CLD).
3-22
Syrrbols
Some common symbols used within a blOCK
are:
Symbol
+
=
->
•
..n.
V
,
Definition
plus, add, true
minus, comple.rrent
equal
is set into
And FUNCTION
OR function
Exclusive OR
and
Example
+ B
A - B
A = B
A
->B
A •
8->C
AAB ->C
A"" B
->C
A->B ,C
Figure 3-21 contains the complete symbol
list.
+
I
+
/
<
?
()
Definition
True Add
A
+
B
Complement
A-B
Equal
A=B
Unequal
AlB
Is set into
A--B
AN D function
A
B_C
OR function
All. B
-+-
C
Exc lusive OR
A 41- B __ C
True-Complement
A
!
B-C
and
A-B,C
or
A/B-+C
Is less than
A<B
not
Is compared to
Function not controlled by the micro program.
Used for normal English punctuation or to enclose
an expression within a statement.
Special - controlled by the user. A footnote at
the bottom of the page explains the function.
Figure 3-21.
CLD Box Symbols
REVIEW QUESTIONS -ROS WORD FORMAT
1.
A CLD box consists of
line statements.
2.
If the CK field is used to emit a
constant, the value is shown on the
line.
3.
The A line contains the ________ __
statements.
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