;
-; Ullrich von Bassewitz, 06.08.1998
+; Ullrich von Bassewitz, 2000-08-06, 2002-12-21
+; Using lots of code from MagerValp, MagerValp@cling.gu.se
;
; void cputcxy (unsigned char x, unsigned char y, char c);
; void cputc (char c);
;
- .export _cputcxy, _cputc, cputdirect, putchar
- .export newline, plot
- .import popa, _gotoxy
- .import xsize, revers
+ .export _cputcxy, _cputc, cputdirect, putchar
+ .export newline, plot
+ .import gotoxy
- .include "c128.inc"
- .include "../cbm/cbm.inc"
+ .include "cbm_kernal.inc"
+ .include "c128.inc"
+
+newline = NEWLINE
+
+;--------------------------------------------------------------------------
+
+.code
_cputcxy:
- pha ; Save C
- jsr popa ; Get Y
- jsr _gotoxy ; Set cursor, drop x
- pla ; Restore C
+ pha ; Save C
+ jsr gotoxy ; Set cursor, drop x and y
+ pla ; Restore C
; Plot a character - also used as internal function
-_cputc: cmp #$0A ; CR?
- bne L1
- lda #0
- sta CURS_X
- beq plot ; Recalculate pointers
+_cputc: cmp #$0A ; CR?
+ beq cr ; Output a cr
-L1: cmp #$0D ; LF?
- beq newline ; Recalculate pointers
+ cmp #$0D ; LF?
+ bne L2
+ jmp NEWLINE ; Update cursor position
; Printable char of some sort
- cmp #' '
- bcc cputdirect ; Other control char
- tay
- bmi L10
- cmp #$60
- bcc L2
- and #$DF
- bne cputdirect ; Branch always
-L2: and #$3F
-
-cputdirect:
- jsr putchar ; Write the character to the screen
+L2: cmp #' '
+ bcc cputdirect ; Other control char
+ tay
+ bmi L5
+ cmp #$60
+ bcc L3
+ and #$DF
+ bne cputdirect ; Branch always
+L3: and #$3F
-; Advance cursor position
+; Output one character to the screen. We will disable scrolling while doing so
-advance:
- iny
- cpy xsize
- bne L3
- jsr newline ; new line
- ldy #0 ; + cr
-L3: sty CURS_X
+cputdirect:
+ tax ; Save output char
+ lda SCROLL
+ pha ; Save scroll flag
+ lda #$C0
+ sta SCROLL ; Disable scrolling
+ txa ; Restore output char
+ jsr PRINT
+ pla
+ sta SCROLL ; Restore old scroll flag
rts
-newline:
- clc
- lda xsize
- adc SCREEN_PTR
- sta SCREEN_PTR
- bcc L4
- inc SCREEN_PTR+1
- clc
-L4: lda xsize
- adc CRAM_PTR
- sta CRAM_PTR
- bcc L5
- inc CRAM_PTR+1
-L5: inc CURS_Y
- rts
-
; Handle character if high bit set
-L10: and #$7F
- cmp #$7E ; PI?
- bne L11
- lda #$5E ; Load screen code for PI
- bne cputdirect
-L11: ora #$40
- bne cputdirect
+L5: and #$7F
+ cmp #$7E ; PI?
+ bne L6
+ lda #$5E ; Load screen code for PI
+ bne cputdirect
+L6: ora #$40
+ bne cputdirect ; Branch always
+; Carriage return
+cr: lda #0
+ sta CURS_X
; Set cursor position, calculate RAM pointers
-plot: ldy CURS_X
- ldx CURS_Y
- clc
- jmp PLOT ; Set the new cursor
-
-
+plot: ldy CURS_X
+ ldx CURS_Y
+ clc
+ jmp PLOT ; Set the new cursor
; Write one character to the screen without doing anything else, return X
; position in Y
-putchar:
- ora revers ; Set revers bit
- ldy CURS_X
- sta (SCREEN_PTR),y ; Set char
- lda CHARCOLOR
- sta (CRAM_PTR),y ; Set color
- rts
+putchar = $CC2F