read_byte
uint8_t *read_byte);
int (*ch)(device_t idev, int mode, uint8_t write_byte, uint8_t *read_byte),
int (*ch)(device_t idev, int mode, uint8_t write_byte, uint8_t *read_byte),
uint8_t *read_byte)
ret = (*aux_data->aux_ch)(idev, mode, write_byte, read_byte);
event = read_byte(fd);
b1 = read_byte(fd);
b2 = read_byte(fd);
b1 = read_byte(fd);
b2 = read_byte(fd);
b1 = read_byte(fd);
b2 = read_byte(fd);
b1 = read_byte(fd);
b1 = read_byte(fd);
b1 = read_byte(fd);
b2 = read_byte(fd);
b1 = read_byte(fd);
read_byte(fd), read_byte(fd));
b1 = read_byte(fd);
b1 = read_byte(fd);
b2 = read_byte(fd);
b1 = read_byte(fd);