SCAN_F1
if (id >= SCAN_F1 && id < SCAN_F1 + MAX_BIOS_DISKS)
return DEFAULT_DISK(id - SCAN_F1);
static const unsigned char key_list[] = { SCAN_ENTER, SCAN_F1, SCAN_1,
|| (key >= SCAN_F1 && key < SCAN_F1 + MAX_BIOS_DISKS)))
id -= SCAN_F1;