(a) Translate the
following sequence of SRC Assembly language statements
into Hex and write a bin file. The format for a bin file
is that each line
contains the 8 Hex digit address followed by 4 spaces followed
by the
instruction in Hex. The first line contains a number only
in the leftmost
column. It is the address to which the PC should be initialized.
Use
Notepad
in the Accessories folder to write
the file and name it
Parta.bin.
Load the file
into the simulator and check to
see if it is correct. If it is, single
step through
the program to make sure that
it runs correctly by first storing
a positive and
then a negative value into the
memory location associated
with X. (See page
58 of your text).
To display the memory area associated with X, type the number
000003e0 into the space
for the address of the first memory cell in the
simulator and press
enter. X is at
location 1000 decimal
or
000003e8 Hex.
Note: It is very easy for you to cheat by using the assembler to translate the source code. If you do, the only one that you’ll be cheating is yourself.
Hand in printouts of Parta.bin and the Simulator window with the
bin file
loaded.
Cost:
.equ 125
.org 1000
X:
.dw 1
.org 5000
lar r0,
Over
ld
r1, X
brpl r0,
r1
neg r1,
r1
st
r1, X
Over:
stop
(b)
Translate the following statement to SRC Assembly language
and test the program to make sure that the values are
stored correctly in the array "ndigit". Be sure
to put a "stop" in
the assimbly code as the last statement to be executed.
Hand in a printout of the "lst" file and a picture of
the simulator
window.
for ( i = 0; i <
10; i++ )
ndigit [ i ] = - i
