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https://gitlab.com/camelot/kickc.git
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86 lines
1.4 KiB
NASM
86 lines
1.4 KiB
NASM
// Show default font on screen
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.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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.label SCREEN = $400
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main: {
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.label screen = 4
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.label ch = 3
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.label x = 2
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// memset(SCREEN, ' ', 1000)
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jsr memset
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lda #0
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sta.z x
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lda #<SCREEN+$28+1
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sta.z screen
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lda #>SCREEN+$28+1
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sta.z screen+1
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lda #0
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sta.z ch
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__b1:
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ldx #0
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__b2:
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// *screen++ = ch++
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lda.z ch
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ldy #0
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sta (screen),y
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// *screen++ = ch++;
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inc.z screen
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bne !+
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inc.z screen+1
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!:
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inc.z ch
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// for( byte y: 0..15)
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inx
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cpx #$10
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bne __b2
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// screen += (40-16)
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lda #$28-$10
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clc
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adc.z screen
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sta.z screen
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bcc !+
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inc.z screen+1
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!:
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// for( byte x: 0..15)
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inc.z x
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lda #$10
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cmp.z x
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bne __b1
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// }
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rts
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}
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// Copies the character c (an unsigned char) to the first num characters of the object pointed to by the argument str.
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memset: {
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.const c = ' '
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.const num = $3e8
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.label str = SCREEN
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.label end = str+num
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.label dst = 6
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lda #<str
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sta.z dst
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lda #>str
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sta.z dst+1
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__b1:
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// for(char* dst = str; dst!=end; dst++)
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lda.z dst+1
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cmp #>end
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bne __b2
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lda.z dst
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cmp #<end
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bne __b2
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// }
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rts
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__b2:
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// *dst = c
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lda #c
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ldy #0
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sta (dst),y
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// for(char* dst = str; dst!=end; dst++)
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inc.z dst
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bne !+
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inc.z dst+1
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!:
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jmp __b1
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}
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