Add handling of write requests

[cc65] / libsrc / c128 / cputc.s

diff --git a/libsrc/c128/cputc.s b/libsrc/c128/cputc.s
index 9ba194290c829e1d1348f65a8b566ac48858a527..e906c242aec2c3bd646e8e0b0cf174f6b453e722 100644 (file)
--- a/libsrc/c128/cputc.s
+++ b/libsrc/c128/cputc.s
@@ -1,106 +1,89 @@
 ;
-; 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
+        .export         _cputcxy, _cputc, cputdirect, putchar
+        .export         newline, plot
+        .import         popa, _gotoxy
         .import         PLOT
 
-       .include        "c128.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     popa            ; Get Y
+        jsr     _gotoxy         ; Set cursor, drop x
+        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
+L2:     cmp     #' '
+        bcc     cputdirect      ; Other control char
+        tay
+        bmi     L5
+        cmp     #$60
+        bcc     L3
+        and     #$DF
+        bne     cputdirect      ; Branch always
+L3:     and     #$3F
 
-cputdirect:
-       jsr     putchar         ; Write the character to the screen
+; Output one character to the screen. We will disable scrolling while doing so
 
-; Advance cursor position
-
-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     RVS             ; Set revers bit
-               ldy     CURS_X
-       sta     (SCREEN_PTR),y  ; Set char
-       lda     CHARCOLOR
-       sta     (CRAM_PTR),y    ; Set color
-       rts
+putchar = $CC2F
+