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80 lines
1.4 KiB
ArmAsm
80 lines
1.4 KiB
ArmAsm
; Tiny Tiny
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; zero page locations
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HGR_SHAPE = $1A
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HGR_SHAPE2 = $1B
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HGR_BITS = $1C
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GBASL = $27
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GBASH = $28
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A5H = $45
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XREG = $46
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YREG = $47
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; C0-CF should be clear
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; D0-DF?? D0-D5 = HGR scratch?
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HGR_DX = $D0 ; HGLIN
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HGR_DX2 = $D1 ; HGLIN
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HGR_DY = $D2 ; HGLIN
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HGR_QUADRANT = $D3
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HGR_E = $D4
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HGR_E2 = $D5
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HGR_X = $E0
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HGR_X2 = $E1
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HGR_Y = $E2
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HGR_COLOR = $E4
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HGR_HORIZ = $E5
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HGR_SCALE = $E7
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HGR_SHAPE_TABLE = $E8
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HGR_SHAPE_TABLE2= $E9
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HGR_COLLISIONS = $EA
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HGR_ROTATION = $F9
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FRAME = $FC
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XPOS = $FD
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YPOS = $FF
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; ROM calls
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HGR2 = $F3D8
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HPOSN = $F411
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XDRAW0 = $F65D
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XDRAW1 = $F661
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RESTORE = $FF3F
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.zeropage
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.globalzp rot_smc
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tiny_tiny:
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jsr HGR2 ; Hi-res, full screen ; E7/E8/E9
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; Y=0, A=0 after this call ; scale/shape
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lda #40 ; EA/EB collision
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sta HGR_SCALE ; EC ED
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tiny_loop:
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inc rot_smc+1 ; EE EF
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; setup X and Y co-ords
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ldy #0 ; Y always 0 ; F0 F1
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ldx #140 ; F2 F3
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lda #96 ; F4
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jsr HPOSN ; X= (y,x) Y=(a) ; F5 F6 F7
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; saves Y/X/A to HGR_Y, HGR_X, HGR_X+1
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; after, Y = X/7
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; after, y = $14 = 20, always
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; A=FF, X=F9
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ldx #<shape_table ; point to our shape ; F8 F9
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ldy #0 ; FA FB
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rot_smc:
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lda #0 ; ROT=0 ; FC FD
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jsr XDRAW0 ; XDRAW 1 AT X,Y ; FE FF 100
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; Both A and X are 0 at exit
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; Z flag set on exit
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beq tiny_loop ; bra
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shape_table:
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; .byte $2D,0 ; shape data
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.byte $3A,$DB,$0 ; accidentally found at addr $0004
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; RT RT is 00 101 101 = 2D
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