mirror of
https://gitlab.com/camelot/kickc.git
synced 2024-10-02 22:56:11 +00:00
93 lines
1.7 KiB
NASM
93 lines
1.7 KiB
NASM
.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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.label print_char_cursor = 6
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.label print_line_cursor = 2
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main: {
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lda #<$400
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sta.z print_char_cursor
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lda #>$400
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sta.z print_char_cursor+1
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lda #<msg
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sta.z print_str.str
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lda #>msg
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sta.z print_str.str+1
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jsr print_str
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lda #<$400
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sta.z print_line_cursor
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lda #>$400
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sta.z print_line_cursor+1
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jsr print_ln
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lda.z print_line_cursor
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sta.z print_char_cursor
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lda.z print_line_cursor+1
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sta.z print_char_cursor+1
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lda #<msg2
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sta.z print_str.str
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lda #>msg2
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sta.z print_str.str+1
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jsr print_str
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jsr print_ln
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lda.z print_line_cursor
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sta.z print_char_cursor
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lda.z print_line_cursor+1
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sta.z print_char_cursor+1
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lda #<msg3
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sta.z print_str.str
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lda #>msg3
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sta.z print_str.str+1
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jsr print_str
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jsr print_ln
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rts
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}
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// Print a newline
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print_ln: {
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__b1:
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lda #$28
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clc
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adc.z print_line_cursor
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sta.z print_line_cursor
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bcc !+
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inc.z print_line_cursor+1
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!:
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lda.z print_line_cursor+1
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cmp.z print_char_cursor+1
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bcc __b1
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bne !+
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lda.z print_line_cursor
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cmp.z print_char_cursor
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bcc __b1
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!:
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rts
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}
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// Print a zero-terminated string
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// print_str(byte* zeropage(4) str)
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print_str: {
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.label str = 4
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__b1:
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ldy #0
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lda (str),y
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cmp #0
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bne __b2
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rts
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__b2:
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ldy #0
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lda (str),y
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sta (print_char_cursor),y
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inc.z print_char_cursor
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bne !+
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inc.z print_char_cursor+1
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!:
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inc.z str
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bne !+
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inc.z str+1
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!:
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jmp __b1
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}
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msg: .text "hello world! "
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.byte 0
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msg2: .text "hello c64! "
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.byte 0
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msg3: .text "hello 2017! "
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.byte 0
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