BS1_BSY
if (ms->phase > selecting && (in_8(&mr->bus_status1) & BS1_BSY)) {
if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
if ((in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) == 0)
if (in_8(&mr->bus_status1) & (BS1_BSY | BS1_SEL)) {
while ((in_8(&mr->bus_status1) & BS1_BSY) == 0) {