1.8 אקסטה פתרון

תרגול – קפיצות, הזזות, והחלפות במעבד 8086

תרגיל 1 – קפיצה Far

IDEAL
MODEL small
STACK 100h
DATASEG
msg db 'Hello from FAR$', 0

CODESEG
start:
    call far ptr printMessage

    mov ax, 4C00h
    int 21h

CSEG2 segment
assume cs:CSEG2
printMessage proc far
    mov ah, 09h
    mov dx, offset msg
    int 21h
    ret
printMessage endp
CSEG2 ends

END start

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תרגיל 2 – שימוש ב־SHL ו־SHR

IDEAL
MODEL small
STACK 100h
DATASEG
CODESEG
start:
    mov al, 3
    shl al, 1
    call print_al

    shr al, 1
    call print_al

    mov ax, 4C00h
    int 21h

print_al:
    push ax
    mov ah, 0Eh
    add al, '0'
    int 10h
    pop ax
    ret
END start

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תרגיל 3 – שימוש ב־XCHG

IDEAL
MODEL small
STACK 100h
DATASEG
newline db 13, 10, '$'
CODESEG
start:
    mov ax, 5
    mov bx, 9
    xchg ax, bx

    ; הדפסת AX
    mov al, ah
    call print_hex
    mov al, al
    call print_hex
    call newline_print

    ; הדפסת BX
    mov ax, bx
    mov al, ah
    call print_hex
    mov al, al
    call print_hex

    mov ax, 4C00h
    int 21h

print_hex:
    push ax
    mov ah, 0Eh
    and al, 0Fh
    add al, '0'
    cmp al, '9'
    jbe skip
    add al, 7
skip:
    int 10h
    pop ax
    ret

newline_print:
    mov ah, 09h
    mov dx, offset newline
    int 21h
    ret
END start

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תרגיל 4 – שימוש ב־LOOP

IDEAL
MODEL small
STACK 100h
DATASEG
CODESEG
start:
    mov cx, 5
print_loop:
    mov ah, 0Eh
    mov al, 'X'
    int 10h
    loop print_loop

    mov ax, 4C00h
    int 21h
END start

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תרגיל בונוס – לולאה שמכפילה מספר כל פעם ב־2

IDEAL
MODEL small
STACK 100h
DATASEG
newline db 13, 10, '$'
CODESEG
start:
    mov al, 1
    mov cx, 4
power_loop:
    shl al, 1
    call print_al
    call newline_print
    loop power_loop

    mov ax, 4C00h
    int 21h

print_al:
    push ax
    mov ah, 0Eh
    mov bl, al
    call print_decimal
    pop ax
    ret

print_decimal:
    xor cx, cx
.next:
    xor dx, dx
    mov ax, bx
    mov bx, 10
    div bx
    push dx
    inc cx
    mov bx, ax
    test ax, ax
    jnz .next
.print:
    pop dx
    add dl, '0'
    mov ah, 02h
    mov dl, dl
    int 21h
    loop .print
    ret

newline_print:
    mov ah, 09h
    mov dx, offset newline
    int 21h
    ret
END start

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