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60 lines
934 B
NASM
60 lines
934 B
NASM
// Test a struct array initialized with to few members (zero-filled for the rest)
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.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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.const OFFSET_STRUCT_POINT_Y = 1
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.label SCREEN = $400
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.label idx = 2
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main: {
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lda #0
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sta.z idx
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tax
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b1:
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txa
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asl
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stx.z $ff
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clc
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adc.z $ff
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tay
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lda points,y
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sta.z print.p_x
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lda points+OFFSET_STRUCT_POINT_Y,y
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sta.z print.p_y
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lda points+OFFSET_STRUCT_POINT_Y+1,y
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sta.z print.p_y+1
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jsr print
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inx
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cpx #4
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bne b1
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rts
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}
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// print(byte zeropage(3) p_x, signed word zeropage(4) p_y)
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print: {
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.label p_x = 3
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.label p_y = 4
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lda.z p_x
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ldy.z idx
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sta SCREEN,y
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iny
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lda.z p_y
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sta SCREEN,y
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iny
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lda.z p_y+1
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sta SCREEN,y
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iny
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lda #' '
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sta SCREEN,y
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iny
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sty.z idx
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rts
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}
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points:
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.byte 1
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.word $83f
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.byte 3
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.word $107e
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.byte 0
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.word 0
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.byte 0
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.word 0
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