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Answer the following questions about 68K assembler conventions. a. What is the effect of the assembler...

Answer the following questions about 68K assembler conventions.

a. What is the effect of the assembler directive ORG $400?

b. What is the effect of the assembler directive DS.W $16?

c. What is the effect of the assembler directive DC.L 16?

d. What is the effect of the ‘+’ in the effective address (A0)+?

e. What is the effect of the ‘-’ in the effective address -(A0)?

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Answer #1

A) Defines the address of the next information element of instruction to be loaded.

B)This directive creates 20 words or 40 bytes of storage from the present location.

C)Store the longword 16 in memory.

D) This indicates auto incrementing (more strictly post-incrementing). After the address register pointer has been used, its contents are incremented by 1, 2, or 4 depending on whether the operand was B, W, or L.

E) This operand indicated predecrementing and is identical to auto-incrementing except that the address register is decremented before it is used to access the operand.

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