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58 lines
1.0 KiB
ArmAsm
58 lines
1.0 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 06.08.1998
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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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.export _cputcxy, _cputc, cputdirect, putchar
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.export newline, plot
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.constructor initcputc
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.destructor donecputc
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.import popa, _gotoxy
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.import PLOT
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.include "c128.inc"
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_cputcxy:
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pha ; Save C
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jsr popa ; Get Y
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jsr _gotoxy ; Set cursor, drop x
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pla ; Restore C
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jmp PRINT
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; Plot a character - also used as internal function
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_cputc = PRINT ; let the kernal handle it
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cputdirect = $c33b
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newline:
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lda #17
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jmp PRINT
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; Set cursor position, calculate RAM pointers
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plot: ldy CURS_X
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ldx CURS_Y
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clc
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jmp PLOT ; Set the new cursor
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; Write one character to the screen without doing anything else, return X
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; position in Y
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putchar = $CC2F
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;--------------------------------------------------------------------------
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; Module constructor/destructor
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initcputc:
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lda #$C0
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.byte $2C
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donecputc:
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lda #$00
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sta SCROLL
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rts
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