174 lines
2.8 KiB
ArmAsm
174 lines
2.8 KiB
ArmAsm
; silly c64
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; 147 initial, top line
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; 145 beq instead of jmp, 0 is already in Y
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; 141 inline draw
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; 146 add READY
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; 136 optimize addr calculation
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; 150 printing READY and skipping line
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; 147 get FF by decrementing 0
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; 146 move increment before the draw
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; 144 have XPOS in A at beginning of loop
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; 142 realize shapes don't have to be aligned at 5
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; needs to be 144 bytes or less
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; zero page locations
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WHICH = $00
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HGR_SHAPE = $1A
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SEEDL = $4E
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FRAME = $A4
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OUR_ROT = $A5
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RND_EXP = $C9
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HGR_COLOR = $E4
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HGR_PAGE = $E6
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HGR_SCALE = $E7
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HGR_ROTATION = $F9
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SCALE = $FC
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XPOS = $FD
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YPOS = $FF
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; Soft Switches
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KEYPRESS = $C000
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KEYRESET = $C010
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SPEAKER = $C030
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PAGE0 = $C054
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PAGE1 = $C055
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; ROM calls
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RND = $EFAE
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HGR2 = $F3D8
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HCLR = $F3F2
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HCLR_COLOR = $F3F4
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HPOSN = $F411
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DRAW0 = $F601
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XDRAW0 = $F65D
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TEXT = $FB36 ; Set text mode
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WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
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dsr_demo:
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;=========================================
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; SETUP
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;=========================================
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jsr HGR2 ; set/clear HGR page1 to black
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; Hi-res graphics, no text at bottom
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; Y=0, A=$60 after this call
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lda #$D5 ; color blue
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jsr HCLR_COLOR
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sty WHICH ; = 0
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dey ; $ff = white2
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sty HGR_COLOR
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lda #2
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sta HGR_SCALE
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;=========================
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; draw letters
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;=========================
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lda #8
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sta YPOS
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lda #23
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; sta XPOS
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; XPOS in A coming in
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first_loop:
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draw:
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; to call draw
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; need to have co-ords set up with HPOSN
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; rotate should be in A
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; lda XPOS
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clc
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adc #8
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sta XPOS
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tax
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; setup X and Y co-ords
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ldy #0 ; XPOSH always 0 for us
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; ldx XPOS
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lda YPOS
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jsr HPOSN ; X= (y,x) Y=(a)
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ldy WHICH
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lda string,Y
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clc
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adc #<shape_table
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tax
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; ldx #<shape_table ; point to our shape (low)
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ldy #>shape_table ; code fits in one page, same always
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lda #0 ; set rotation
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jsr DRAW0 ; XDRAW 1 AT X,Y
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; Both A and X are 0 at exit
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inc WHICH
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ldy WHICH
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lda XPOS
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cpy #28
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bne no_adjust
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sty YPOS ; want 32, 28 is close
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lda #$ff
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sta XPOS
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no_adjust:
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cpy #33
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bne first_loop
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end:
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beq end
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shape_table:
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.byte $3f,$24,$2d,$05,$00 ; C 0
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.byte $3f,$24,$2d,$36,$00 ; O 1
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.byte $24,$37,$3c,$36,$00 ; M 2
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.byte $3b,$24,$ad,$06,$00 ; D 3
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.byte $1f,$24,$35,$07,$00 ; R 4
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.byte $3f,$2c,$27,$2d,$00 ; E 5
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.byte $23,$24,$00 ; I 6
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.byte $02,$00 ; space 7
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;.byte $3b,$24,$ad,$06,$00 ; 4 8
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;.byte $3f,$24,$2d,$05,$00 ; B 9
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;.byte $3f,$24,$2d,$36,$00 ; A 10
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;.byte $24,$37,$3c,$36,$00 ; S 11
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;.byte $3b,$24,$ad,$06,$00 ; I 12
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;.byte $3f,$24,$2d,$05,$00 ; Y 13
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;.byte $3f,$24,$2d,$36,$00 ; * 14
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;.byte $24,$37,$3c,$36,$00 ; * 15
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string:
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; * * * * C O M M O D O R E
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.byte 10,10,10,10,33,0, 5,10,10, 5,15, 5,20,25,33
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; 6 4 B A S I C * * * *
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.byte 15,10,33,15,10,15,30,0, 33,10,10,10,10
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; 28
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; R E A D Y
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.byte 20,25,10,15,30
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; 5
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