git.sur5r.net Git - cc65/blob - libsrc/cbm/cclear.s

   1 ;
   2 ; Ullrich von Bassewitz, 08.08.1998
   3 ;
   4 ; void cclearxy (unsigned char x, unsigned char y, unsigned char length);
   5 ; void cclear (unsigned char length);
   6 ;
   7
   8         .export         _cclearxy, _cclear
   9         .import         gotoxy, cputdirect
  10         .importzp       tmp1
  11
  12 _cclearxy:
  13         pha                     ; Save the length
  14         jsr     gotoxy          ; Call this one, will pop params
  15         pla                     ; Restore the length and run into _cclear
  16
  17 _cclear:
  18         cmp     #0              ; Is the length zero?
  19         beq     L9              ; Jump if done
  20         sta     tmp1
  21 L1:     lda     #$20            ; Blank - screen code
  22         jsr     cputdirect      ; Direct output
  23         dec     tmp1
  24         bne     L1
  25 L9:     rts