32byte Megademo by SquoQuo

32byte Megademo by SquoQuo [web]

screenshot added by Hopper/SquoQuo on 2012-10-01 08:37:51

platform :	Atari XL/XE Atari XL/XE
type :	32b 32b
release date :	september 2012
release party :	Function 2012
compo :	pc 256b
ranked :	4th

popularity : 59%

59%

0.88

alltime top: #7505

Hopper/SquoQuo [Code]

added on the 2012-10-01 08:37:51 by Hopper/SquoQuo

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rulez added on the 2012-10-01 08:44:49 by nitro2

Out 32 byte Atari contribution to the 256 byte PC compo. Code is loosely based on Wallflower XL by JAC!.
Complete sourecode:

Code:


	org $4000
	sei					;disable all interrupts
loop
	lda RTCLOK+2		;generate a moving, varying number pattern based on system clock and rasterline
	ora VCOUNT
	adc RTCLOK+1
	sta $d009,y			;don't use all GTIA registers (found by trial&error)
	bmi jumper			;every 128 frames do some more glitchy stuff
	and #$79				;the other 128 frames mask out some bits to get more stable graphics/sounds
	tay					;and save it as new index
jumper
	sta $d200,y			;trigger some sound stuff
	bpl weiter			;if we've taken the second 128 frames above, just continue to the end
	and #$77				;otherwise mask out another set of bits and use as index for next frame
	tay
weiter
	bpl loop				;since all values are garantueed to be positive now, just loop

The intro runs about 21 minutes before looping, so have fun ;-)

added on the 2012-10-01 08:46:51 by Hopper/SquoQuo

\o/

rulez added on the 2012-10-01 09:12:27 by Raven^NCE