sc_vtb_putchar
sc_vtb_putchar(&scp->vtb, p, map[ch], attr);
p = sc_vtb_putchar(&scp->vtb, p, map[*ptr], attr);
p = sc_vtb_putchar(&scp->scr, p, c, a);
vm_offset_t sc_vtb_putchar(sc_vtb_t *vtb, vm_offset_t p, int c, int a);