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126 lines
2.6 KiB
ArmAsm
126 lines
2.6 KiB
ArmAsm
;
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; Written by Groepaz/Hitmen <groepaz@gmx.net>
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; Cleanup by Ullrich von Bassewitz <uz@cc65.org>
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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
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.constructor initconio
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.import popa, _gotoxy
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.import setcursor
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.importzp tmp3,tmp4
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.include "creativision.inc"
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.include "boxchars.inc"
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;-----------------------------------------------------------------------------
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.code
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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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; Plot a character - also used as internal function
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_cputc: cmp #$0d ; CR?
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bne L1
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lda #0
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sta CURSOR_X
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beq plot ; Recalculate pointers
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L1: cmp #$0a ; LF?
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beq newline ; Recalculate pointers
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; Printable char of some sort
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cputdirect:
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jsr putchar ; Write the character to the screen
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; Advance cursor position
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advance:
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ldy CURSOR_X
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iny
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cpy #SCREEN_COLS
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bne L3
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inc CURSOR_Y ; new line
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ldy #0 ; + cr
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L3: sty CURSOR_X
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jmp plot
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newline:
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inc CURSOR_Y
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; Set cursor position, calculate RAM pointers
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plot: ldy CURSOR_X
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ldx CURSOR_Y
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jmp setcursor ; 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:
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cmp #$5B
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bcc IS_UPPER
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clc
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sbc #$1F
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IS_UPPER:
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cmp #$20
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bcc BAD_CHAR
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pha
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lda SCREEN_PTR
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sei
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sta VDP_CONTROL_W
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lda SCREEN_PTR+1
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ora #$40
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sta VDP_CONTROL_W
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pla
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clc
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adc #160
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sta VDP_DATA_W
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cli
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BAD_CHAR:
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jmp plot
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;-----------------------------------------------------------------------------
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; Initialize the conio subsystem. Code goes into the INIT segment, which may
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; be reused after startup.
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.segment "INIT"
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initconio:
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lda #$0
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sta SCREEN_PTR
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lda #$10
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sta SCREEN_PTR+1
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; Copy box characters to slot
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sei
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lda #08
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sta VDP_CONTROL_W
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lda #$46
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sta VDP_CONTROL_W
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ldx #0
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LL:
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lda boxchars,x
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sta VDP_DATA_W
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inx
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cpx #48
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bne LL
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cli
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jmp plot
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