Suppose the hypothetical processor of also has two I/O instructions: 0011 = Load AC from I/O 0111
Question:
0011 = Load AC from I/O
0111 = Store AC to I/O
In these cases, the 12-bit address identifies a particular external device.
Show the program execution (using format of Figure 1.4) 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. Discuss.
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1 a The PC contains 300 the address of the first instruction This value is loaded in to the MAR b Th...View the full answer
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Related Book For 
Operating Systems Internals and Design Principles
ISBN: 978-0133805918
8th edition
Authors: William Stallings
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