mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-05-28 17:41:29 +00:00
83 lines
1.0 KiB
ArmAsm
83 lines
1.0 KiB
ArmAsm
; Barse
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; first attempt
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; zero page
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GBASL = $26
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GBASH = $27
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YY = $69
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ROW_SUM = $70
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HGR_X = $E0
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HGR_XH = $E1
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HGR_Y = $E2
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HGR_COLOR = $E4
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HGR_PAGE = $E6
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LINE = $FF
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; soft-switches
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FULLGR = $C052
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PAGE1 = $C054
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; ROM routines
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HGR2 = $F3D8
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HPOSN = $F411 ; (Y,X),(A) (values stores in HGRX,XH,Y)
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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;================================
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; Clear screen and setup graphics
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;================================
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bars:
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jsr HGR2 ; set hi-res 140x192, page2, fullscreen
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; A and Y both 0 at end
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sty LINE
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line_loop:
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lda LINE
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jsr HPOSN ; (Y,X),(A) (values stores in HGRX,XH,Y)
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lda GBASL
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sta output_smc+1
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lda GBASH
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sta output_smc+2
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; first top right
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ldx #0
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out_loop:
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ldy #0
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lda GBASH
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sta output_smc+2
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in_loop:
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lda #$FF
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output_smc:
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sta $4000,X
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lda output_smc+2
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clc
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adc #$4
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sta output_smc+2
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iny
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cpy #8
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bne in_loop
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lda #50
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jsr WAIT
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inx
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cpx #40
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bne out_loop
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lda LINE
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clc
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adc #$8
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sta LINE
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cmp #192
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bne line_loop
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end:
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jmp end
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