Most Tektronix hex files contain only Tektronix hex lines (see the next section), which always start with a slash (``/'') character. There are only two types of lines - data lines and a termination line.

Data lines have five fields: address, length, checksum 1, data and checksum 2. The lines always start with a slash (``/'') character. allbox,center,tab(;); lf(CW) l l l l l. /;Address;Length;Checksum1;Data;Checksum2

Address

This is a 4 character (2 byte) address that specifies where the data in the record is to be loaded into memory.

Data Length

The data length field is a 2 character (1 byte) field that specifies the number of character pairs (bytes) in the data field. This field never has a value of zero.

Checksum 1

The checksum 1 field is a 2 character (1 byte) field. Its value is the 8-bit sum of the six 4-bit values which make up the address and length fields.

Data

The data field contains character pairs (bytes); the number of character pairs (bytes) is indicated by the length field.

Checksum 2

The checksum 2 field is a 2 character (1 byte) field. Its value is the least significant byte of the sum of the all the 4-bit values of the data field.

Termination lines have three fields: address, zero and checksum. The lines always start with a slash (``/'') character. allbox,center,tab(;); lf(CW) l l l. /;Address;Zero;Checksum

Address

This is a 4 character (2 byte) address that specifies where to begin execution.

Zero

The data length field is a 2 character (1 byte) field of value zero.

Checksum

The checksum 1 field is a 2 character (1 byte) field. Its value is the 8-bit sum of the six 4-bit values which make up the address and zero fields.

In general, binary data will expand in sized by approximately 2.4 times when represented with this format.