* Where the fields fall on the formatted screen used by tncomp, tnrecv,
#define SEND_SEQUENCE_LENGTH 23
#define ACK_SEQUENCE (SEND_SEQUENCE+SEND_SEQUENCE_LENGTH+1)
#define ACK_SEQUENCE_LENGTH 22
#define CHECKSUM (ACK_SEQUENCE+ACK_SEQUENCE_LENGTH+1)
#define CHECKSUM_LENGTH 32
#define DATA (CHECKSUM+CHECKSUM_LENGTH+1)
#define DATA_LENGTH ((80*22)+79)