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https://github.com/deater/dos33fsprogs.git
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92 lines
1.2 KiB
ArmAsm
92 lines
1.2 KiB
ArmAsm
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; Print-shop Style THINKING
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; by Vince `deater` Weaver <vince@deater.net>
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.include "zp.inc"
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.include "hardware.inc"
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COL = $F0
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XSTART = $F1
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XSTOP = $F2
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YSTART = $F3
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YSTOP = $F4
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thinking:
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jsr SETGR ; set lo-res 40x40 mode
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; A=$D0 afterward
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; COL value doesn't matter?
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lda #0
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sta YSTART
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sta XSTART
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lda #20
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sta YSTOP
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asl
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sta XSTOP
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box_loop:
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ldx YSTART
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yloop:
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txa
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jsr GBASCALC ; take Y-coord/2 in A, put address in GBASL/H ( a trashed, C clear)
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lda COL
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and #$7
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tay
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lda color_lookup,Y
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ldy XSTART
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xloop:
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sta (GBASL),Y
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iny
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cpy XSTOP
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bne xloop
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inx
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cpx YSTOP
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bne yloop
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inc COL
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inc XSTART
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inc XSTART
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dec XSTOP
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dec XSTOP
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inc YSTART
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dec YSTOP
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lda YSTOP
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cmp #10
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bne box_loop
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;0 1 2 3 3
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;0123456789012345678901234567890123456789
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; ***** * * * * * * * * * * ***
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; * * * * ** * * * * ** * * *
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; * * * * ** * * * * ** * *
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; * **** * * * * ** * * * * *
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; * * * * * ** * * * * ** * **
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; * * * * * ** * * * * ** * *
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; * * * * * * * * * * * ****
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;
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; 7*5 bytes = 35 bytes
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thinking_loop:
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end:
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jmp end
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color_lookup:
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; magenta, pink, orange, yellow, lgreen, aqua, mblue, lblue
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.byte $33,$BB,$99,$DD,$CC,$EE,$66,$77
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