Record Formats

Header Record

Field	Columns	Contents
Type	1	H
Name	2-7	Program name
Address	8-13	Starting address of the program in hexadecimal
Length	14-19	Length of object program in bytes, as hexadecimal

Text Record

Field	Columns	Contents
Type	1	T
Address	2-7	Starting address for object code in this record as hexadecimal
Length	8-9	Length of this record in bytes (hexadecimal)
Object Code	10-69	Object code, represented as hexadecimal (2 columns per byte of object code)

End Record

Field	Columns	Contents
Type	1	E
Address	2-7	Address of the first executable instruction in the program in hexadecimal

Modification Record

Field	Columns	Contents
Type	1	M
Address	2-7	Starting address of the field to be modified, relative to the beginning of the control section (hexadecimal)
Length	8-9	Length of the field to be modified, in half-bytes (hexadecimal)
Flag	10	Modification flag (+ or -)
Symbol	11-16	External symbol whose value is to be added to or subtracted from the indicated field

Original Modification Record

In section 2.2 of System Software, the original modification record is shown as follows:

Field	Columns	Contents
Type	1	M
Address	2-7	Starting location of the address field to be modified, relative to the beginning of the program (hexadecimal)
Length	8-9	Length of the address field to be modified, in half-bytes (hexadecimal)

This is only used for program relocation. Once the revised modification record is introduced, program relocation is done there by setting the symbol column to the name of the control section.

Define Record

Field	Columns	Contents
Type	1	D
Name	2-7	Name of external symbol defined in this control section
Address	8-13	Relative address of symbol within this control section (hexadecimal)
Repeat	14-73	Repeat information in Col. 2-13 for other external symbols

Refer Record

Field	Columns	Contents
Type	1	R
Name	2-7	Name of external symbol referred to in this control section
Repeat	8-73	Names of other external reference symbols