TTYC_SETAB
[TTYC_SETAB] = { TTYCODE_STRING, "setab" },
if (!tty_term_has(tty->term, TTYC_SETAB)) {
tty_putcode_i(tty, TTYC_SETAB, gc->bg - 90 + 8);
tty_putcode_i(tty, TTYC_SETAB, gc->bg);
else if (tty_term_has(tty->term, TTYC_SETAB))
tty_putcode_i(tty, TTYC_SETAB, colour & 0xff);