99 Bottles of Beer

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Language Assembler (6510)

Date:	04/20/05
Author:	Johannes Tevessen
URL:	n/a
Comments:	2
Info:	n/a
Score:	(3.29 in 28 votes)

; 
99 bottles of beer - C64 6510 assembler version
; 
written 2001 by Johannes Tevessen <j.tevessen@gmx.net>
;
; 
Self-modifying code.
; 
Compiled size: 192 byte plus 2 byte loading offset.
; 
If you can make a shorter version doing the same,
; 
please contact me.
;
; 
Compile, for example, to $C000 and start
; 
using:
; 
	LOAD "64BEER",8,1
; 
	NEW
; 
	SYS 49152
;
; 
for example: as64 -sC000 64beer.S -o 64beer
;
; 
This code is downloadable:
;
; 
Source: 
	http://www.dummy.de/c64/64beer.S
; 
Compiled: 
	http://www.dummy.de/c64/64beer.bin
;
; 
The code looks like this:
;
; $ ./thex <64beer
; 000000:  00C0A263 2054C0A9 5EA01C20 44C0A9BC    ...c T..^.. D...
; 000010:  A0022044 C02054C0 A95EA010 2044C0A9    .. D. T..^.. D..
; 000020:  7AA02120 44C0CA20 54C0A95E A01C2044    z.! D.. T..^.. D
; 000030:  C0A97AA0 022044C0 8AD0C9A9 9BA02520    ..z.. D.......%
; 000040:  44C0A95E A01E8D48 C0AD00C0 20D2FFEE    D..^...H.... ...
; 000050:  48C088D0 F4608A48 A90020CD BD68AA60    H.....H.. ..h...
; 000060:  20424F54 544C4553 204F4620 42454552     BOTTLES OF BEER
; 000070:  204F4E20 54484520 57414C4C 2E0D5441     ON THE WALL..TA
; 000080:  4B45204F 4E452044 4F574E2C 20504153    KE ONE DOWN, PAS
; 000090:  53204954 2041524F 554E442C 0D474F20    S IT AROUND,.GO
; 0000A0:  544F2054 48452053 544F5245 20414E44    TO THE STORE AND
; 0000B0:  20425559 20534F4D 45204D4F 52452C0D     BUY SOME MORE,.
; 0000C0:  3939                                   99

; 
.org 
$C000

org: 
ldx 
#99
bloop: 
jsr 
xout
	lda	#<bobot
	ldy	#28
	jsr	strout
	lda	#<comcr
	ldy	#2
	jsr	strout
	jsr	xout
	lda	#<bobot
	ldy	#16
	jsr	strout
	lda	#<bobpa
	ldy	#33
	jsr	strout
	dex
	jsr	xout
	lda	#<bobot
	ldy	#28
	jsr	strout
	lda	#<bobpa
	ldy	#2
	jsr	strout
	txa
	bne	bloop
	lda	#<endtx
	ldy	#37
	jsr	strout
	lda	#<bobot
	ldy	#30
strout: 
sta 
ldins+1
ldins: 
lda 
org
	jsr	$ffd2
	inc	ldins+1
	dey
	bne	ldins
outdon: 
rts

xout: 
txa
	pha
	lda	#0
	jsr	$bdcd
	pla
	tax
	rts

bobot: 
.text 
" BOTTLES OF BEER ON THE WALL"
bobpa: 
.text 
"."
	.byte	13
	.text	"TAKE ONE DOWN, PASS IT AROUND,"
	.byte	13
endtx: 
.text 
"GO TO THE STORE AND BUY SOME MORE"
comcr: 
.text 
","
	.byte	13
	.text	"99"

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Alternative Versions

Comments

xtr said on 08/23/05 10:54:22

Yeah! - just tried it out - it runs ;-)
From the rules to be known.. :
"Real programmers write self-modifying code, espacially if it can safe 20 nanoseconds in the middle of a tight loop"

xtr

dr beep said on 11/30/05 07:55:22

When you place the endtext in front of BOBOT you can put the last two print commands together and you won't be needing the last JSR to the BOBOT-text.

Shortens the code like this

LDA #<ENDTX
LDY #37
JSR STROUT
LDA #<BOBOT
LDY #30

becomes
LDA #<ENDTX
LDY #67

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