vga_raster_cursor
vga_raster_cursor(scr, 0,
vga_raster_cursor(scr, 1, scr->cursorrow,
static void vga_raster_cursor(void *, int, int, int);
vga_raster_cursor,
vga_raster_cursor(scr, scr->cursoron, scr->cursorrow, scr->cursorcol);