Function txt_clear_screen

sys/msdos/vidtxt.c:156–187

}

void
txt_clear_screen(void)
/* djgpp provides ScreenClear(), but in version 1.09 it is broken
 * so for now we just use the BIOS Routines
 */
{
    union REGS regs;
#ifdef PC9800
    regs.h.dl = attr98[attrib_text_normal];
    regs.h.ah = SETATT;
    regs.h.cl = DIRECT_CON_IO;

    (void) int86(DOS_EXT_FUNC, &regs, &regs);

    regs.h.dl = 0x02; /* clear whole screen */
    regs.h.ah = SCREEN_CLEAR;
    regs.h.cl = DIRECT_CON_IO;

    (void) int86(DOS_EXT_FUNC, &regs, &regs);
#else
    regs.h.dl = (char) (CO - 1); /* columns */
    regs.h.dh = (char) (LI - 1); /* rows */
    regs.x.cx = 0;               /* CL,CH = x,y of upper left */
    regs.x.ax = 0;
    regs.x.bx = 0;
    regs.h.bh = (char) attrib_text_normal;
    regs.h.ah = (char) SCROLL;
    /* DL,DH = x,y of lower rt */
    (void) int86(VIDEO_BIOS, &regs, &regs); /* Scroll or init window   */
    txt_gotoxy(0, 0);
#endif
}

/* clear to end of line */
void txt_cl_end(int col, int row)