The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson

PROGRAMMING CONCEPTS–I 2-17

i) All labels should begin with a letter or the special characters @, $, _ , and ?

ii) A label can have 1 to 31 characters, which may be digits, letters in upper or lower

case or the special characters at (@), dollar ($), underscore (_), dot (.) or question

mark (?).

iii) No reserved words of MASM may be used.

iv) Each label must be unique.

The second field is the opcode or instruction field. The third is the operand field, and the

last is the comment field which starts with a semicolon. The use of comments is advised

for making programs more readable.

2.4 | Instruction Design

Until now, we were discussing assemblers, the best assemblers available and how to run

our programs using assemblers and other program dev ...