mirror of https://gitlab.com/camelot/kickc.git
259 lines
4.4 KiB
NASM
259 lines
4.4 KiB
NASM
/// @file
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/// A lightweight library for printing on the C64.
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///
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/// Printing with this library is done by calling print_ function for each element
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// Commodore 64 PRG executable file
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.file [name="sieve-kc.prg", type="prg", segments="Program"]
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.segmentdef Program [segments="Basic, Code, Data"]
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.segmentdef Basic [start=$0801]
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.segmentdef Code [start=$80d]
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.segmentdef Data [startAfter="Code"]
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.segment Basic
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:BasicUpstart(__start)
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.const COUNT = $4000
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.const SQRT_COUNT = $80
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.label print_screen = $400
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.label last_time = $a
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.label print_line_cursor = 4
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.label Ticks = 8
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.label Ticks_1 = 6
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.label print_char_cursor = 2
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.segment Code
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__start: {
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// unsigned int last_time
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lda #<0
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sta.z last_time
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sta.z last_time+1
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jsr main
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rts
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}
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main: {
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// start()
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jsr start
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// round()
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jsr round
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// round()
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jsr round
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// round()
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jsr round
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// round()
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jsr round
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// round()
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jsr round
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// round()
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jsr round
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// round()
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jsr round
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// round()
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jsr round
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// round()
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jsr round
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// round()
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jsr round
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// end()
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jsr end
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// }
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rts
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}
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start: {
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.label LAST_TIME = last_time
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// asm
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jsr $ffde
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sta LAST_TIME
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stx LAST_TIME+1
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// }
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rts
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}
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round: {
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.label p = 4
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.label S = 2
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lda #<Sieve
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sta.z p
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lda #>Sieve
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sta.z p+1
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__b1:
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// for(char* p=Sieve;p<Sieve+COUNT;++p)
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lda.z p+1
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cmp #>Sieve+COUNT
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bcc __b2
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bne !+
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lda.z p
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cmp #<Sieve+COUNT
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bcc __b2
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!:
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ldx #2
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__b3:
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// while (I < SQRT_COUNT)
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cpx #SQRT_COUNT
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bcc __b4
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// }
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rts
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__b4:
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// if (Sieve[I] == 0)
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lda Sieve,x
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cmp #0
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bne __b5
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// I<<1
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txa
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asl
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// S = Sieve + I<<1
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clc
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adc #<Sieve
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sta.z S
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lda #>Sieve
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adc #0
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sta.z S+1
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__b6:
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// while (S < Sieve + COUNT)
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lda.z S+1
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cmp #>Sieve+COUNT
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bcc __b7
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bne !+
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lda.z S
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cmp #<Sieve+COUNT
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bcc __b7
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!:
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__b5:
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// ++I;
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inx
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jmp __b3
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__b7:
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// *S = 1
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lda #1
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ldy #0
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sta (S),y
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// S += I
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txa
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clc
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adc.z S
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sta.z S
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bcc !+
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inc.z S+1
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!:
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jmp __b6
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__b2:
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// *p = 0
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lda #0
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tay
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sta (p),y
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// for(char* p=Sieve;p<Sieve+COUNT;++p)
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inc.z p
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bne !+
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inc.z p+1
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!:
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jmp __b1
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}
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end: {
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// Ticks = last_time
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lda.z last_time
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sta.z Ticks
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lda.z last_time+1
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sta.z Ticks+1
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// start()
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jsr start
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// last_time -= Ticks
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lda.z last_time
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sec
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sbc.z Ticks
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sta.z last_time
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lda.z last_time+1
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sbc.z Ticks+1
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sta.z last_time+1
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// Ticks = last_time
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lda.z last_time
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sta.z Ticks_1
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lda.z last_time+1
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sta.z Ticks_1+1
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// print_uint(Ticks)
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jsr print_uint
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// print_ln()
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jsr print_ln
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// }
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rts
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}
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// Print a unsigned int as HEX
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// void print_uint(__zp(6) unsigned int w)
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print_uint: {
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.label w = 6
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// print_uchar(BYTE1(w))
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ldx.z w+1
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lda #<print_screen
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sta.z print_char_cursor
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lda #>print_screen
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sta.z print_char_cursor+1
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jsr print_uchar
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// print_uchar(BYTE0(w))
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ldx.z w
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jsr print_uchar
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// }
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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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lda #<print_screen
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sta.z print_line_cursor
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lda #>print_screen
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sta.z print_line_cursor+1
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__b1:
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// print_line_cursor + 0x28
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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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// while (print_line_cursor<print_char_cursor)
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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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// }
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rts
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}
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// Print a char as HEX
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// void print_uchar(__register(X) char b)
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print_uchar: {
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// b>>4
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txa
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lsr
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lsr
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lsr
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lsr
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// print_char(print_hextab[b>>4])
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tay
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lda print_hextab,y
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// Table of hexadecimal digits
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jsr print_char
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// b&0xf
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lda #$f
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axs #0
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// print_char(print_hextab[b&0xf])
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lda print_hextab,x
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jsr print_char
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// }
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rts
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}
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// Print a single char
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// void print_char(__register(A) char ch)
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print_char: {
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// *(print_char_cursor++) = ch
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ldy #0
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sta (print_char_cursor),y
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// *(print_char_cursor++) = ch;
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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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// }
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rts
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}
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.segment Data
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print_hextab: .text "0123456789abcdef"
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.align $100
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Sieve: .fill COUNT, 0
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