The hypothetical machine of Figure 3.4 also has two I/O instructions: 0011 = Load AC from I/O
Question:
0011 = Load AC from I/O
0011 = Store AC to I/O
In these cases, the 12-bit address identifies a particular I/O device. Show the program execution (using the format of Figure 3.5) for the following program:
1. Load AC from device 5.
2. Add contents of memory location 940.
3. Store AC to device 6.
Assume that the next value retrieved from device 5 is 3 and that location 940 contains a value of 2.
Figure 3.4
Characteristics of a Hypothetical Machine
Transcribed Image Text:
0 3 4 15 Opcode Address (a) Instruction format 15 Magnitude (b) Integer format program counter (PC) Address of instruction Instruction register (IR) Instruction being executed Accumulator (AC)Temporary storage (c) Internal CPU registers 0001 Load AC from memory 0010 Store AC to memory 0101 Add to AC from memory (d) Partial list of opcodes
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Related Book For
Computer organization and architecture designing for performance
ISBN: 978-0136073734
8th edition
Authors: william stallings
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