File: cclear.s

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;
; Ullrich von Bassewitz, 08.08.1998
;
; void cclearxy (unsigned char x, unsigned char y, unsigned char length);
; void cclear (unsigned char length);
;

        .export         _cclearxy, _cclear
        .import         gotoxy, cputdirect
        .importzp       tmp1

_cclearxy:
        pha                     ; Save the length
        jsr     gotoxy          ; Call this one, will pop params
        pla                     ; Restore the length and run into _cclear

_cclear:
        cmp     #0              ; Is the length zero?
        beq     L9              ; Jump if done
        sta     tmp1
L1:     lda     #$20            ; Blank - screen code
        jsr     cputdirect      ; Direct output
        dec     tmp1
        bne     L1
L9:     rts