Question

1. What are assembler directives? Explain what the following assembler directives achieve: (a) ORG, (b) EQU, (c) RMB, (d) BSZ, (e) FCB, (f) FCC, (g) FILL

Answer 1

What are assembler directives? Explain what the following assembler directives achieve: (a) ORG, (b) EQU, (c) RMB, (d) BSZ, (e) FCB, (f) FCC, (g) FILL

Ans: Assembler directives are instruction that directs the assembler to do something. It directs the assembler to perform a task with some commands available. storage reservations can also get accomplished by assembler directives. Assembler directives are a command which is part of assembler syntax but not an instruction set.

(a) ORG : The origin directives set the location counter to a specified location.

(b) EQU : This assembler directive gives a symbolic name to a numeric value.

(c) RMB: This directive is used to reserve areas of memory

(d) BSZ: This directive causes the assembler to allocates block of bytes

(e) FCB: It set associates memory bytes to some value given by the operand

(f) FCC: It used to store ASCII string into consecutive bytes of memory

(g) FILL: It used to reserve a block of memory to fill with a given value