Put your social security number in the right hand corner of the page of each page. Please do not put your name anywhere on this quiz. Failure to follow these instructions will cost you 1 point on the quiz. Note: Be sure to show all your work and no calculators. You will have until the end of class to complete the quiz.
1.
(2 points) Add the two 2C binary numbers for each
situation.
Also indicate the value (0 for
false, or 1 for true) for each of the condition codes indicated.
Note:
Your answer should be in 2C binary (radix 2).
N Z V C
a) 11111110
+
10011001
--------------
10010111
1 0 0 1
N Z
V C
b) 01101110
+
01100001
--------------
11001111 1 0
1 0
2.
(5 points) We have
seen five types of addressing so far
Immediate (IMM), Direct (DIR),
Extended(EXT),
Inherent (INH), and Relative (REL). For
each situation (piece
of code) indicate its addressing mode
abbreviation:
Addressing Mode
a) fred staa $1004 EXT
b) bra start REL
c) start
ldab #$aa IMM
d) sam
beq fred REL
e) subb #%00010001 IMM
f) tba INH
g) lab1
ldab $f9 DIR
h) lab2
nop INH
i) adda $feee EXT
j) chuck
staa $30 DIR
3. (3 points) Hand
assemble the following code into the listing table given:
|
0001 |
00e1 |
|
|
|
|
|
org |
|
$00e1 |
|
0002 |
00e1 |
|
|
|
cnt |
|
rmb |
|
1 |
|
0003 |
f800 |
|
|
|
|
|
org |
|
$f800 |
|
0004 |
f800 |
86 |
0c |
|
start |
|
ldaa |
|
#$0c |
|
0005 |
f802 |
97 |
e1 |
|
|
|
staa |
|
cnt |
|
0006 |
f804 |
20 |
fe |
|
theend |
|
bra |
|
theend |
4. (5 points) Hand
disassemble the following memory locations, then hand execute the program
instructions giving
the value of the PC, B and CCR (N Z V C) if known:
|
|
|
|
|
|
|
|
PC |
B |
CCR(NZVC) |
|
|
|
|
|
org |
$F805 |
|
F805 |
? |
? |
|
F805 |
F6 |
|
start |
LDAB |
|
|
F806 |
? |
? |
|
F806 |
FA |
|
|
|
|
|
F807 |
? |
? |
|
F807 |
00 |
|
|
|
$FA00 |
|
F808 |
80 |
1 0 0 - |
|
F808 |
5A |
|
|
DECB |
|
|
F809 |
7F |
0 0 1 - |
|
|
|
|
|
org |
$FA00 |
|
FA00 |
80 |
|
|
fcb |
$80 |