atari_scc
atari_scc.cha_a_ctrl = 9;
atari_scc.cha_a_ctrl = (char) 0xc0; /* hardware reset */
if (scc_test(&atari_scc.cha_a_ctrl)) {
} while (!(atari_scc.cha_b_ctrl & 0x01)); /* wait for rx buf filled */
return atari_scc.cha_b_data;
atari_scc.cha_b_ctrl = (reg); \
atari_scc.cha_b_ctrl = (val); \
(void)atari_scc.cha_b_ctrl; /* reset reg pointer */
} while (!(atari_scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
atari_scc.cha_b_data = c;