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; this file modified for use with taipan:
; - \n treated like \r\n used to: moves cursor to
; start of next line.
; - \r no longer special (prints a graphics character)
; - $0a no longer treated as as \n (prints graphics char)
; - _cputcxy removed as taipan never uses it
;
; Mark Keates, Christian Groessler
;
; void cputcxy (unsigned char x, unsigned char y, char c);
; void cputc (char c);
;
;.export _cputcxy, _cputc
.export _cputc
.export plot, cputdirect, putchar
.import popa, _gotoxy
.importzp tmp4,ptr4
.import _revflag
.include "atari.inc"
.include "mul40.s"
;_cputcxy:
;pha ; Save C
;jsr popa ; Get Y
;jsr _gotoxy ; Set cursor, drop x
;pla ; Restore C
_cputc:
; cmp #$0D ; CR
; bne L4
; lda #0
; sta COLCRS
; beq plot ; return
L4: ;cmp #$0A ; LF
;beq newline
cmp #ATEOL ; Atari-EOL?
beq newline
tay
rol a
rol a
rol a
rol a
and #3
tax
tya
and #$9f
ora ataint,x
cputdirect: ; accepts screen code
jsr putchar
; advance cursor
inc COLCRS
lda COLCRS
cmp #40
bcc plot
lda #0
sta COLCRS
.export newline
newline:
lda #0
sta COLCRS
inc ROWCRS
lda ROWCRS
cmp #24
bne plot
lda #0
sta ROWCRS
plot:
ldy COLCRS
ldx ROWCRS
rts
; update screen
; if called directly, putchar prints the screen code in A
; without updating the cursor position.
putchar:
pha ; save char
ldy #0
lda ROWCRS
jsr mul40 ; destroys tmp4
clc
adc SAVMSC ; add start of screen memory
sta ptr4
txa
adc SAVMSC+1
sta ptr4+1
pla ; get char again
ora _revflag
sta OLDCHR
ldy COLCRS
sta (ptr4),y
rts
.rodata
ataint: .byte 64,0,32,96
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