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93 lines
2.0 KiB
ArmAsm
93 lines
2.0 KiB
ArmAsm
;
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; adapted from Atari version
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; Christian Groessler, 2014
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;
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; void cputcxy (unsigned char x, unsigned char y, char c);
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; void cputc (char c);
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;
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.include "atari5200.inc"
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.export _cputcxy, _cputc
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.export plot, cputdirect, putchar
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.import gotoxy, _mul20
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.importzp ptr4
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.import setcursor
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.constructor screen_setup, 26
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.import screen_setup_20x24
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screen_setup = screen_setup_20x24
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_cputcxy:
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pha ; Save C
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jsr gotoxy ; Set cursor, drop x and y
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pla ; Restore C
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_cputc:
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cmp #$0D ; CR
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bne L4
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lda #0
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sta COLCRS_5200
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beq plot ; return
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L4: cmp #$0A ; LF
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beq newline
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cmp #ATEOL ; Atari-EOL?
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beq newline
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tay
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rol a
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rol a
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rol a
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rol a
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and #3
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tax
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tya
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and #$9f
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ora ataint,x
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cputdirect: ; accepts screen code
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jsr putchar
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; advance cursor
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inc COLCRS_5200
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lda COLCRS_5200
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cmp #20
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bcc plot
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lda #0
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sta COLCRS_5200
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.export newline
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newline:
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inc ROWCRS_5200
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lda ROWCRS_5200
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cmp #24
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bne plot
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lda #0
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sta ROWCRS_5200
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plot: jsr setcursor
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ldy COLCRS_5200
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ldx ROWCRS_5200
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rts
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putchar:
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pha ; save char
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lda ROWCRS_5200
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jsr _mul20 ; destroys tmp4, carry is cleared
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adc SAVMSC ; add start of screen memory
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sta ptr4
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txa
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adc SAVMSC+1
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sta ptr4+1
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pla ; get char again
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ldy COLCRS_5200
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sta (ptr4),y
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jmp setcursor
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.rodata
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ataint: .byte 64,0,32,96
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