32: add small file

demos/32b/small.s

@@ -0,0 +1,118 @@
+HGR_SHAPE	=	$1A
+HGR_SHAPEH	=	$1B
+HGR_HPAGE	=	$E6
+HGR_SCALE	=	$E7
+OFFSET		=	$FE
+HGR_ROTATE	=	$FF
+
+
+KEYPRESS        =       $C000
+KEYRESET        =       $C010
+
+HGR		=	$F3E2
+HCLR		=	$F3F2
+HPOSN		=	$F411
+HPLOT0		=	$F457
+HGLIN		=	$F53A
+XDRAW		=	$F65D
+XDRAW1		=	$F661
+COLORTBL	=	$F6F6
+
+WAIT    = $FCA8                 ;; delay 1/2(26+27A+5A^2) us
+
+start:
+	;==========================
+	; Setup Graphics
+	;==========================
+
+;	We can't use HGR as it clears the screen
+	jsr	HGR
+
+	;======================
+	; Setup vars
+	;======================
+
+	lda	#1
+	sta	HGR_SCALE
+	sta	HGR_ROTATE
+
+	; HFNS	puts X-coord in Y,X, Y-coord in A
+	; HPOSN sets up GBASL/GBASH
+
+loop:
+
+	ldy	#0		; high byte of x position
+	ldx	#140		; low byte of x position
+	lda	#96		; y position
+	jsr	HPOSN
+
+	ldx	#<portal_vert
+	ldy	#>portal_vert
+	jsr	random_byte
+;	lda	HGR_ROTATE	; rotation
+	jsr	XDRAW
+
+;	jsr	wait_until_keypress
+
+	jsr	random_byte
+;	lda	#200
+	jsr	WAIT
+
+	jsr	random_byte
+	ora	#$1
+	and	#$3
+	sta	HGR_SCALE
+
+;	lda	HGR_SCALE
+;	eor	#$2
+;	sta	HGR_SCALE
+
+;	inc	HGR_ROTATE
+
+	bit	$C030
+
+	jmp	loop
+
+
+; Shape 1
+;
+; "Portal"
+;   #
+;  # #
+;  # #
+;  # #
+; #   #
+; #   #
+; # * #
+; #   #
+; #   #
+;  # #
+;  # #
+;  # #
+;   #
+;
+; START
+; NLT NLT UP UP UP NRT UP UP UP NRT RT NDN
+; DN DN DN NRT DN DN DN DN DN NLT DN DN DN NLT
+; UP NLT UP UP UP NLT UP UP UP
+; STOP
+
+portal_vert:
+.byte $1b,$24,$0c,$24,$0c,$15,$36,$0e,$36, $36,$1e,$36,$1e,$1c,$24,$1c,$24
+.byte $04,$00
+
+random_byte:
+	inc	OFFSET
+	lda	OFFSET
+	and	#$1f
+	tay
+	lda	start,Y
+	rts
+
+wait_until_keypress:
+        lda     KEYPRESS
+        bpl     wait_until_keypress
+
+        lda     KEYRESET                ; clear strobe
+
+	rts