Some of the common rules of assembly level language are as follows:

★ In assembly language the label field can be either empty or may specify a symbolic address.

★ Instruction fields can specify pseudo or machine instructions.

★ Comment fields can be left empty or can be commented with.

★ Up to 4 characters are only allowed in the case of symbolic addresses.

★ The symbolic addresses field are terminated by a comma whereas the comment field begins with a forward slash.