User`s manual

Tektronix Hex Format
Data Blocks
Byte Number
1 Header (which is a forward slash- /)
2—5 Location counter which is 4 ascii-hex characters
representing the load address of the data bytes.
6—7 Byte count which is 2 ascii hex bytes specifying the
number of binary data bytes in the data field of the
block.
8—9 First Checksum, which is 2 ascii-hex bytes
specifying the HEX SUM of the values of the
previous six digits. (location counter and the byte
count)
10—X Binary data bytes which are each represented as 2
ascii-hex digits. (in other words 16 binary bytes are
represented as 32 ascii-hex bytes.)
X+ 1—X+ 2 Second Checksum. 2 ascii-hex bytes representing
the SUM, modulo 256 of the binary values of the
ascii data bytes. (8 bit sum without carry.)
X+ n Always a carriage return. (CR)
Termination Block
Byte Number
1 Header (forward slash /)
2—5 Transfer address which is the address for execution
of code.
6—7 Byte count, always 00 for a termination block.
8—9 Checksum of the six digits that make up the transfer
and byte count.
10 Always a carriage return. (CR)
Model 9000 Hex Formats Chapter 7
Page 29