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#REDIRECT [[Pl EXOS 1.DOC/fr]]
  
  +
EXERCISES I
  +
  +
-------------------------
  +
  +
  +
- Solutions to the exercises proposed in this file are present
  +
in the file: CORRIG_1.DOC
  +
------------
  +
You just need to note the exercise number whose answer you want to know.
  +
  +
  +
  +
  +
------------------
  +
  +
No. 1:
  +
------
  +
  +
Find the error (easy...)
  +
  +
  +
text
  +
  +
ab move.b #345,d0
  +
add.b #1,d0
  +
jmp ab
  +
  +
end
  +
  +
  +
No. 2:
  +
------
  +
What will the data register d3 contain?
  +
  +
text
  +
  +
move.l #12,d3
  +
add.l #4,d3
  +
add.l d3,d3
  +
move.l var,d2
  +
add.l d2,d3
  +
  +
data ;data segment
  +
  +
var dc.l 458
  +
  +
end
  +
  +
  +
No. 3:
  +
------
  +
What will the d5 register contain?
  +
  +
  +
text
  +
  +
move ici,d4
  +
add #5,d4
  +
move d4,la
  +
add ici,la
  +
move la,d5
  +
  +
data
  +
  +
ici dc.w 10
  +
  +
bss
  +
  +
la ds.w 1
  +
  +
end
  +
  +
No. 4:
  +
-----
  +
Find the value of a4 at the end of the program knowing that the label 'ad' is
  +
located at an address equal to $ff0 and it points to (dc.l) the number 45
  +
  +
Find the value of d5:
  +
  +
text
  +
  +
move.l #ad,a4
  +
move.l ad,d5
  +
  +
data
  +
  +
ad dc.l 45 ; it is assumed that here PC=$ff0
  +
  +
end
  +
  +
  +
No. 5:
  +
-----
  +
Find the value of d5 and a5 following this program.
  +
  +
text
  +
  +
move #15,d5
  +
move.l #zz,a5
  +
move.w zz,d5
  +
  +
data
  +
  +
zz dc.w 0
  +
  +
end
  +
  +
  +
  +
- I will now use the control operation instruction 'DBF' which allows the
  +
execution of a loop and whose syntax is: 'DBF Dn,loop'. This instruction
  +
uses a data register Dn and a Destination Label. Each call, Dn is decremented by 1
  +
unit, if Dn equals -1, the program continues after the instruction that follows
  +
'DBF' otherwise the instruction performs a jump to the Destination address.
  +
  +
example:
  +
--------
  +
text
  +
  +
move.b #1,d3 ;d3=1 from the beginning
  +
move.w #99,d0 ;number of loops -1 (because we go until -1!)
  +
  +
tgv add.b #1,d3 ;we add 1 to d3 until d0=-1, so
  +
dbf d0,tgv ;100 times in a row
  +
  +
move.b d3,var ;then we put d3.b (=101) in var
  +
;NB: d0 equals -1 ...
  +
bss
  +
  +
var ds.b 1
  +
  +
end
  +
  +
  +
No. 6:
  +
-----
  +
Find the value contained at the address out, the value of d0 and d5 at
  +
the end of this program.
  +
  +
text
  +
  +
move #247,d0
  +
move #3,d5
  +
  +
bbb add #8,d0
  +
move d0,out
  +
dbf d5,bbb
  +
  +
bss
  +
  +
out ds.b 2
  +
  +
end
  +
  +
  +
No. 7:
  +
-----
  +
Find the BINARY value of the data register d1 at the end of this program.
  +
NB:5438=%0001010100111110
  +
  +
text
  +
  +
move #5391,d0
  +
add #47,d0
  +
  +
move d0,dix
  +
move.b in,d1
  +
  +
bss
  +
  +
dix ds.b 1
  +
in ds.w 47
  +
  +
data
  +
  +
nul dc.w 5438
  +
  +
end
  +
  +
  +
No. 8:
  +
-----
  +
what will happen at 'gag'?
  +
  +
text
  +
  +
move.l #gag,a2
  +
  +
gag move.b #100,d1
  +
jmp (a2)
  +
  +
end
  +
  +
No. 9:
  +
-----
  +
What will be the value of d3 after this program?
  +
  +
text
  +
  +
move.b #12,lab
  +
move.b #14,lac
  +
move.b #15,lad
  +
  +
move.l #lab,a3
  +
move.b #1,d1
  +
  +
fff move.b (a3)+,d3
  +
dbf d1,fff
  +
  +
add.b (a3),-(a3)
  +
move.b -(a3),d3
  +
add.b (a3),d3
  +
  +
bss
  +
  +
lab ds.w 1
  +
lac ds.b 1
  +
lad ds.w 5
  +
  +
end
  +
  +
  +
No. 10:
  +
------
  +
  +
What will be the values of d0,d1,d2,d3,a0 after this program?
  +
  +
text
  +
  +
move.b #10,a
  +
move.b #11,b
  +
move.b #12,c
  +
move.b #13,d
  +
move.b #98,e
  +
  +
move.l #deb,a0
  +
move.b (a0)+,d0
  +
move.b (a0)+,d1
  +
move.b (a0)+,d2
  +
move.b (a0),d3
  +
move.b -(a0),d4
  +
  +
bss
  +
  +
deb ds.b 1
  +
a ds.b 1
  +
b ds.b 1
  +
c ds.b 1
  +
d ds.b 1
  +
e ds.b 1
  +
f ds.l 4
  +
  +
end
  +
  +
No. 11:
  +
------
  +
Find the value of a4 and d0,d1 after this program.
  +
  +
text
  +
  +
move.b #3,d0
  +
move.l #pil,a4
  +
  +
rrr move.b -(a4),d1
  +
add.b #4,d1
  +
dbf d0,rrr
  +
  +
data
  +
  +
dc.b 1,2,3,4,5,6,7,8,9
  +
pil dc.w 245
  +
  +
end
  +
  +
No. 12:
  +
------
  +
Find out what is in 'out' and the value of d2.
  +
  +
text
  +
  +
a equ 3
  +
b equ 5
  +
  +
move.b a,d2
  +
add.b b,d2
  +
  +
move.l #g,a5
  +
move.b d2,(a5)
  +
move.b d2,-(a5)
  +
move.b (a5)+,d2
  +
move.b (a5),d2
  +
  +
bss
  +
  +
out ds.b 1
  +
g ds.b 4
  +
  +
end
  +
  +
No. 13:
  +
------
  +
Find the value of d1,d2,d3,d4 and a0.
  +
  +
text
  +
  +
move.l #out,a0
  +
move.w #2,d3
  +
move.w (a0),d1
  +
move.w -4(a0),d2
  +
move.w -4(a0,d3),d3
  +
move.w -(a0),d4
  +
data
  +
  +
dc.l 1
  +
dc.w 12
  +
dc.w 2356
  +
out dc.b 15
  +
  +
end
  +
  +
No. 14:
  +
------
  +
What are the different values taken by a0 during this program?
  +
What is the final value contained in 'res'?
  +
  +
text
  +
  +
move.l #a,a5
  +
move.l #2,d2
  +
  +
ttt move.b #1,(a5)+
  +
dbf d2,ttt
  +
move.b #5,(a5)
  +
  +
move.l #vec,a1
  +
move.b #3,d0
  +
move.b #0,d2
  +
  +
cde move.l 0(a1,d2),a0
  +
add.l #4,d2
  +
move.b (a0),res
  +
dbf d0,cde
  +
  +
data
  +
  +
vec dc.l a,b,c,d
  +
  +
bss
  +
  +
a ds.b 1
  +
b ds.b 1
  +
c ds.b 1
  +
d ds.b 1
  +
res ds.b 1
  +
  +
end
  +
  +
No. 15:
  +
------
  +
Find the value pointed by ret, at the end of this program.
  +
  +
text
  +
  +
move.l #5,a
  +
move.l #a,a0
  +
  +
move.l (a0)+,d2
  +
move.l d2,ret
  +
  +
bss
  +
  +
a ds.l 2
  +
ret ds.l 1
  +
  +
end
  +
  +
No. 16:
  +
-----
  +
Find the value of d0 and a0 after this program.
  +
  +
text
  +
  +
move.b #3,d1
  +
move.b #a,a0
  +
  +
mno move.b 1(a0,d1),d0
  +
add.b #14,d0
  +
add.b a,d0
  +
dbf d1,mno
  +
  +
data
  +
  +
a dc.b 0,5,6,7,8,9
  +
  +
end
  +
  +
No. 17:
  +
------
  +
Find the value of d3 after this program.
  +
  +
text
  +
  +
move.l #a,a0
  +
move.b #5,(a0)+
  +
move.b #6,(a0)+
  +
  +
move.b -(a0),d2
  +
move.l #a,a0
  +
move.b 1(a0),d3
  +
add.b d2,d3
  +
  +
bss
  +
  +
a ds.w 1
  +
ds.b 1
  +
  +
end
  +
  +
No. 18:
  +
------
  +
Find out what happens at 'stp', what does 'res' contain?
  +
  +
text
  +
  +
move.w #5,d3
  +
add.b #6,d2
  +
add.b d2,d3
  +
move.l #ad,a0
  +
  +
stp jmp 10(a0)
  +
  +
ad move.l #5,res
  +
move.b d3,res
  +
  +
bss
  +
  +
res ds.b 1
  +
  +
end
  +
  +
No. 19:
  +
------
  +
Now some quick questions:
  +
  +
a) If I write 'MOVE.W #0,d0', what will happen at the level of the CCR?
  +
And if I write afterwards 'ADD.W #-2,d0'?
  +
  +
b) Can we place a BYTE at an odd address?
  +
  +
c) How many digits is an L-M encoded in HEXADECIMAL?
  +
  +
d) Can we use the PC to store a digit as with a data or address register?
  +
(I remind you that it is a register).
  +
If yes, how?
  +
  +
e) The directive 'END' ends the program and allows the return to the DESKTOP,
  +
True or False? Argue.
  +
  +
f) A macro instruction is a subroutine called by the Linker every
  +
time it encounters its name in the object code.
  +
True or False? Explain.
  +
  +
g) You can use any addressing mode for the operands of the
  +
68000 instructions.
  +
True or False?
  +
  +
  +
-----------------
  +
  +
  +
When you are finished with these exercises, look at the solutions
  +
in the CORRIG_1.DOC file then go back to the courses.
  +
Good luck! ------------
  +
  +
  +
  +
  +
PIECHOCKI Laurent
  +
8,impasse Bellevue
  +
57980 TENTELING
  +
  +
  +
  +
Back to [[ASM_Tutorial]]
  +
[[Category: ASSEMBLER 68000 on ATARI ST Part 1 ]]

Revision as of 01:08, 17 December 2023

                              EXERCISES   I

                        -------------------------


- Solutions to the exercises proposed in this file are present 

 in the file: CORRIG_1.DOC
                   ------------
 You just need to note the exercise number whose answer you want to know.




                           ------------------

No. 1:

Find the error (easy...) 


    text

ab move.b #345,d0 

    add.b     #1,d0
    jmp       ab

    end


No. 2:

What will the data register d3 contain? 

    text

    move.l    #12,d3
    add.l     #4,d3
    add.l     d3,d3
    move.l    var,d2
    add.l     d2,d3

    data                ;data segment

var dc.l 458 

    end


No. 3:

What will the d5 register contain? 


    text

    move      ici,d4
    add       #5,d4
    move      d4,la
    add       ici,la
    move      la,d5

    data

ici dc.w 10 

    bss

la ds.w 1 

    end

No. 4:

Find the value of a4 at the end of the program knowing that the label 'ad' is located at an address equal to $ff0 and it points to (dc.l) the number 45

Find the value of d5: 

    text

    move.l    #ad,a4
    move.l    ad,d5
         
    data

ad dc.l 45  ; it is assumed that here PC=$ff0 

    end


No. 5:

Find the value of d5 and a5 following this program. 

    text

    move      #15,d5
    move.l    #zz,a5
    move.w    zz,d5    
    
    data

zz dc.w 0 

    end


- I will now use the control operation instruction 'DBF' which allows the 

   execution of a loop and whose syntax is: 'DBF  Dn,loop'. This instruction 
   uses a data register Dn and a Destination Label. Each call, Dn is decremented by 1
   unit, if Dn equals -1, the program continues after the instruction that follows
   'DBF' otherwise the instruction performs a jump to the Destination address.

  example:
  --------
    text
    
    move.b    #1,d3        ;d3=1 from the beginning
    move.w    #99,d0       ;number of loops -1 (because we go until -1!)

tgv add.b #1,d3 ;we add 1 to d3 until d0=-1, so 

    dbf       d0,tgv       ;100 times in a row

    move.b    d3,var       ;then we put d3.b (=101) in var
                           ;NB: d0 equals -1 ...
    bss

var ds.b 1 

    end


No. 6:

Find the value contained at the address out, the value of d0 and d5 at the end of this program. 

    text

    move      #247,d0
    move      #3,d5

bbb add #8,d0 

    move      d0,out
    dbf       d5,bbb

    bss

out ds.b 2 

    end


No. 7:

Find the BINARY value of the data register d1 at the end of this program. NB:5438=%0001010100111110 

    text

    move      #5391,d0
    add       #47,d0

    move      d0,dix
    move.b    in,d1

    bss

dix ds.b 1 in ds.w 47 

    data

nul dc.w 5438 

    end


No. 8:

what will happen at 'gag'? 

    text

    move.l    #gag,a2

gag move.b #100,d1 

    jmp       (a2)

    end

No. 9:

What will be the value of d3 after this program? 

    text

    move.b    #12,lab
    move.b    #14,lac
    move.b    #15,lad

    move.l    #lab,a3
    move.b    #1,d1

fff move.b (a3)+,d3 

    dbf       d1,fff

    add.b     (a3),-(a3)
    move.b    -(a3),d3
    add.b     (a3),d3

    bss

lab ds.w 1 lac ds.b 1 lad ds.w 5 

    end


No. 10:

What will be the values of d0,d1,d2,d3,a0 after this program? 

    text

    move.b    #10,a
    move.b    #11,b
    move.b    #12,c
    move.b    #13,d
    move.b    #98,e

    move.l    #deb,a0
    move.b    (a0)+,d0
    move.b    (a0)+,d1
    move.b    (a0)+,d2
    move.b    (a0),d3
    move.b    -(a0),d4

    bss

deb ds.b 1 a ds.b 1 b ds.b 1 c ds.b 1 d ds.b 1 e ds.b 1 f ds.l 4 

    end

No. 11:

Find the value of a4 and d0,d1 after this program. 

    text

    move.b    #3,d0
    move.l    #pil,a4

rrr move.b -(a4),d1 

    add.b     #4,d1
    dbf       d0,rrr

    data

    dc.b      1,2,3,4,5,6,7,8,9

pil dc.w 245 

    end

No. 12:

Find out what is in 'out' and the value of d2. 

    text

a equ 3 b equ 5 

    move.b    a,d2
    add.b     b,d2

    move.l    #g,a5
    move.b    d2,(a5)    
    move.b    d2,-(a5)
    move.b    (a5)+,d2
    move.b    (a5),d2

    bss

out ds.b 1 g ds.b 4 

    end

No. 13:

Find the value of d1,d2,d3,d4 and a0. 

    text

    move.l    #out,a0
    move.w    #2,d3
    move.w    (a0),d1
    move.w    -4(a0),d2
    move.w    -4(a0,d3),d3
    move.w    -(a0),d4
    data

    dc.l      1
    dc.w      12
    dc.w      2356

out dc.b 15 

    end

No. 14:

What are the different values taken by a0 during this program? What is the final value contained in 'res'? 

    text
    
    move.l    #a,a5
    move.l    #2,d2

ttt move.b #1,(a5)+ 

    dbf       d2,ttt
    move.b    #5,(a5)

    move.l    #vec,a1
    move.b    #3,d0
    move.b    #0,d2

cde move.l 0(a1,d2),a0 

    add.l     #4,d2
    move.b    (a0),res
    dbf       d0,cde

    data

vec dc.l a,b,c,d 

    bss

a ds.b 1 b ds.b 1 c ds.b 1 d ds.b 1 res ds.b 1 

    end

No. 15:

Find the value pointed by ret, at the end of this program. 

    text

    move.l    #5,a
    move.l    #a,a0

    move.l    (a0)+,d2
    move.l    d2,ret

    bss

a ds.l 2 ret ds.l 1 

    end

No. 16:

Find the value of d0 and a0 after this program. 

    text

    move.b    #3,d1
    move.b    #a,a0

mno move.b 1(a0,d1),d0 

    add.b     #14,d0
    add.b     a,d0
    dbf       d1,mno

    data

a dc.b 0,5,6,7,8,9 

    end

No. 17:

Find the value of d3 after this program. 

    text

    move.l    #a,a0
    move.b    #5,(a0)+
    move.b    #6,(a0)+

    move.b    -(a0),d2
    move.l    #a,a0
    move.b    1(a0),d3
    add.b     d2,d3

    bss

a ds.w 1 

    ds.b      1 

    end

No. 18:

Find out what happens at 'stp', what does 'res' contain? 

    text

    move.w    #5,d3
    add.b     #6,d2
    add.b     d2,d3
    move.l    #ad,a0

stp jmp 10(a0)

ad move.l #5,res 

    move.b    d3,res 

    bss

res ds.b 1 

    end

No. 19:

Now some quick questions:

a) If I write 'MOVE.W #0,d0', what will happen at the level of the CCR? 

  And if I write afterwards 'ADD.W #-2,d0'?

b) Can we place a BYTE at an odd address?

c) How many digits is an L-M encoded in HEXADECIMAL?

d) Can we use the PC to store a digit as with a data or address register? 

  (I remind you that it is a register).
  If yes, how?

e) The directive 'END' ends the program and allows the return to the DESKTOP, 

  True or False? Argue.

f) A macro instruction is a subroutine called by the Linker every 

  time it encounters its name in the object code.
  True or False? Explain.

g) You can use any addressing mode for the operands of the 

  68000 instructions.
  True or False? 



                          -----------------


When you are finished with these exercises, look at the solutions in the CORRIG_1.DOC file then go back to the courses. Good luck! ------------



PIECHOCKI Laurent 8,impasse Bellevue 57980 TENTELING


Back to ASM_Tutorial

Retrieved from ‘https://www.atari-wiki.com/index.php?title=Pl_EXOS_1.DOC&oldid=1000000898’