FizzBuzz/Assembly: Difference between revisions
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{{collection|FizzBuzz}}
==
<syntaxhighlight lang="asm">FIZZBUZZ CSECT A SECTION OF CODE STARTS HERE, LABEL IT FIZZBUZZ
**********HOUSE KEEPING AREA**********************
USING *,12 FOR THIS PROGRAM WE ARE GOING TO USE REGISTER 12
Line 87:
**********HOUSE KEEPING AREA**********************
SAVE DS 18F
END HELLO </
==
The modulus operation is rather expensive on the 6502,
so a simple counter solution was chosen.
<syntaxhighlight lang="asm"> .lf fzbz6502.lst
.cr 6502
.tf fzbz6502.obj,ap1
Line 171:
Buzz .da #0
;------------------------------------------------------
.en </
==
This implementation uses two counters instead of divisions for the moduli.
<
; FizzBuzz for Motorola 68000 under AmigaOs 2+ by Thorham
;
Line 271:
buzz
dc.b "Buzz",0</
==
<syntaxhighlight lang="asm">;; CP/M FizzBuzz in 8080 assembly
bdos: equ 5 ; CP/M calls
puts: equ 9
max: equ 100 ; Amount of lines to print
org 100h
mvi d,max
lxi b,0305h ; Fizz and buzz counters
line: lxi h,num + 2 ; Increment the ASCII number
incn: inr m
mov a,m
cpi '9' + 1
jnz print
mvi m,'0'
dcx h
jmp incn
print: mvi e,0 ; Mark that we haven't output anything
dcr b ; Time for fizz?
cz fizzo
dcr c ; Time for buzz?
cz buzzo
dcr e ; Output number if nothing else has been printed
jz check
lxi h,num
call outs
check: lxi h,nl ; Output a newline
call outs
dcr d ; More lines?
jnz line
ret
;; "Fizz", and reset the fizz counter
fizzo: lxi h,fizz
mvi b,3
inr e
jmp outs
;; "Buzz", and reset the buzz counter
buzzo: lxi h,buzz
mvi c,5
mvi e,1
;; Output string in HL preserving registers
outs: push b
push d
push h
mvi c,puts
xchg
call bdos
pop h
pop d
pop b
ret
;; Strings
fizz: db 'Fizz$'
buzz: db 'Buzz$'
num: db '000$'
nl: db 13, 10, '$'</syntaxhighlight>
===8086 Assembly===
Assembly programs that output a number on the screen are programmable in two ways: calculating the number in binary to convert it next in ASCII for output,
or keeping the number in Binary Coded Decimal (BCD) notation
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is a multiple of five, so the number is never displayed,
because it is replaced by the string "buzz".
<
mov dx,03030h ; For easier printing, the number is
;kept in Binary Coded Decimal, in
Line 391 ⟶ 458:
buzz: ;The "buzz" string.
db "buzz"</
==
For the Amstrad CPC (should work with e.g. the built-in assembler in JavaCPC; use <tt>call &4000</tt> to start from BASIC):
<
wr_char equ &bb5a ; write ASCII character in register A to screen
cursor equ &bb78 ; get cursor position
Line 513 ⟶ 580:
buzz:
db "Buzz"</
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