IBM 2030 Manual Of Instruction page 197

4. The ROS branches are indicated on
the R line.
5. The symbol.! may be a add
or a add.
6. The operation that is executed by
question 5 is shown on the arithmet-
ic line and is further controlled by
the statement on the __________ _
line.
7. -> means
8. The symbol for the exclusive OR
function is
9. Each ROS word is executed in a
ROS cycle.
10. statement(s) can be
executed during one cycle.
MICRO-PROGRAM EXAMPLES
BINARY ADD
You have seen the many parts that, put
together, make up the micro-program. To
tie these pieces together, lets·s work
our way through a micro program for a
fixed point binary add.
R R RX
FIXED FLT. PT. FIXED FLT, PT,
BITS 3,
~
0123
4567 0000 0001 0010 0011 0100 OJOT
0110
0111
0 0000 Load Load Load Half
Positive Positive Positive Store Ste .. Store D Store S
Load Load Load Load
I 0001
Negative Negative Negative Address
Load & load & load & Store
2 0010
Test Test Test
Char.
Load Load Load
Insert
3 0011 Complement
Complement Complement
Char.
Set Prog
4 0100
Ma,k
AND Halve
Halve Execute
AND
Bronch& Compare Branch &
Compare
5
0101 link Logical link Logicql
Branch on Branch on
6
0110 Count OR Count OR
Branch on Branch on
7 0111
ea,d
XOR Cond XOR
Half
B 1000 Set Tag Lead Load Lead Load Lead
Load D
Load S
I"",,,
Half
9 1001 Tag Compare Compare Compare Compare Compare Compare Compare
Monitor
Half
A 1010 Call Add Add N D Add N S Add Add Add N D Add N S
Half
B 1011 Subtract Sub N D Sub N S S,b S,b
Sub N D Sub N S
Half
C 1100 Multiply Mutt D MuitS Multiply Mult Mult D MuttS
D 1101 Divide Divide D Divide S Divide Divide 0 Divide S
Convert
Add
E 1110 Add Add U D Add U S to Dec logical
Add U D Add U S
Subtract Convert
Subtract
F
1111 logical
S'" U D
Sub U S to Bin logical Sub U D Sub U S
Figure 3-22. Op Codes
The instruction for a binary add is
written in RR format. Figure 3-22 shows
the Op code for Fixed-Point Binary Add
to be 1A in hexadecimal. RR format, if
you will remember, is two bytes in
length. The first byte is the Op code.
The second byte of the instruction con-
sists of two general purpose register
addresses in hexadecimal.
In the example you will be working
through, assume that the data in general
purpose register 5 must be added to the
data in general purpose register 7. The
instruction to accomplish this becomes
1
A
1 5
0001 1010 0111 0101.
The first byte is the Op code lA. The
last byte represents the addresses of
the two registers.
Let·s briefly review the addressing
of a general purpose register. A reg-
ister contains four bytes of data.
Since only one byte of data is addressa-
ble at a time, the N-register address
RS INV SS
HIOPS LO OPS
A C
1000 1001 1010 1011 1100 1101 1110
1111
Set Sys
SteM
Mask
Multiple
Test
Move Move With
Under Mask Numeric
Offset
Load Move
PSW Cnar. Move Pack
Move
Diagnose
Zone Unpack
Present AND
AND
Compare Compare
Accept Logical Logical
Branch
X HI OR OR
Branch
X LO-EQ XOR XOR
Shift Load Zero and
RT S L Multiple
Add
Shift
Left S L Compare
Shift
RT S A Add
Shift
Left
SA Subtract
Shift Start
RT D L 1-0 Translate Multiply
Shift T." Translate
Left D L 1-0 and Test Divide
Shift Halt
RT D A
1-0
Edit
Shift Test Edit and
Left DA Channel Marl<
3-23