A computer uses a memory of 65,536 words with eight bits in each word. It has the
Question:
A computer uses a memory of 65,536 words with eight bits in each word. It has the following registers: PC, AR, TR (16 bits each), and AC, DR, IR (eight bits each). A memory-reference instruction consists of three words: an 8-bit operation-code (one word) and a 16-bit address (in the next two words). All operands are eight bits. There is no indirect bit.
a. Draw a block diagram of the computer showing the memory and registers as in Fig. 5-3. (Do not use a common bus).
b. Draw a diagram showing the placement in memory of a typical three-word instruction and the corresponding 8-bit operand.
c. List the sequence of microoperations for fetching a memory reference instruction and then placing the operand in DR. Start from timing signal T0.
Fig. 5-3
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