Always, on every assignment, please write your name legibly as it appears
on your University ID and on the class list! All assignments will be due
at the start of class on the day indicated, and unless there is what
insurance companies call "an act of God" - something outside your
control; the only exceptions to this rule will be by advance arrangement.
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Background:
Consider the following very small SMAL Hawk program loops for a while
and then halts:
USE "hawk.macs"
USE "monitor.h"
S .
LIL R3,#7FFFFF ; R3 = a big number
LOOP: ; do {
ADDSI R3,-1 ; R3 = R3 - 1
BR CONTINUE
; -----------------------
CONTINUE:
BNR LOOP ; while (R3 >= 0)
LOAD R1,PEXIT
JSRS R1,R1 ; exit
END
Problem:
Split this program into
two separately assembled source files that can be linked;
divide it at the point marked by the dashed line.
The logic must not change, but you may need to change
some branch instructions to jump instructions in order to get between
the separate bits of your code. Turn in assembly listings of the two source
files.
(1 point)
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Background:
Your operating system includes a window manager. Ignore all window operations
except w.at(x,y) and w.put(ch) (where w is a window
object, x and y are integers, and ch is a character).
Window objects are polymorphic (there are several kinds of windows).
a)
Design the header file window.h that gives the interface to all
window objects.
(1/2 point)
b)
Given that R3 contains a pointer to a window object, and given
that R4 contains a character, write code to call the put
method of that window, passing that character, assuming the definitions
and comments given in your header file.
(1/2 point)
-
Here is a logic circuit for a weird way to make one of the
flipflops given in Chapter 11 of the notes:
a)
What kind of flipflop is this?
(1/2 points)
b)
Mark the inputs and outputs that correspond most closely to R, S,
R, S, D, C, Q or Q
connections to this flipflop. Of course, it can't be both an RS and a
D flipflop, so you should not use any irrelevant labels from this list.
(1/2 point).
NOTICE:
The submission instructions
instructions given in the assignment for MP4 are wrong!
in a file called mp4.a, to the submission directory called mp4.
Machine Problem 5, Due July 27
a) Divide your solution to Machine Problem 4 so that the pseudo-random number
generator is a separately assembled component from the main program with the
game logic in it. Your solution should reside in a directory with the name
mp5. Inside this directory, there should be 3 source files,
main.a, random.a, and random.h.
b) Add logic to the program so that it terminates and displays this
message (approximately centered on the screen) if your asterisk bumps
up against the edge of the screen.
+---------+
| YOU WIN |
+---------+
In implementing this, consider that the same code could print either the
winning or the losing message, and that this code could therefore be in
a subroutine, and that this subroutine could be separately compiled from
the main program (adding yet another assembly source file to your directory,
plus its interface).
Note:
This game is not really very challenging unless the population of hash
marks on the screen is higher or unless there is an "intelligent" nemisis.
Those improvements are left to your imagination.
Submitting your result:
Use the submit command on the department linux cluster.
Submit your source directory (mp5) for the course c060
and the submission directory mp5. (Yes, it is legal to submit
an entire directory! Your directory may contain .o files as
well, but these will be ignored in grading.
Grading:
The usual warnings apply. Failure to include appropriate TITLE
directories in each file that ought to have a title will be penalized.
For files that should not have titles, there should be appropriate header
comments. As much as half of the total credit will be granted for
"beautiful code".
