is the target of an absolute branch if the
accumulator is zero.
Project Description
Design and implement a program to simulate the operation of the SIMMAC based on the
descriptions above.
Add a HALT instruction that dumps the contents of all registers and memory and then prints
an “End of Job” message.
Your project must implement multi-tasking in a single queue using a round-robin scheduling
discipline. You will implement process entities (jobs) that will allow your machine to run
several SIMMAC machine-language programs. In order to do this you will define a Process
Control Block (PCB) data structure that will be created for each job in your system. For this
assignment assume each SIMMAC instruction is equivalent to one clock cycle. Additionally
the time quantum value for round-robin scheduling is an integer multiple of a clock cycle.
The quantum value is to be set on the command line or prompted for during initialization.
You will define the notion of an interrupt handler that will process a time quantum for each
running job. On each job switch, you will print some state information such as which job will
be loaded and the current state of the job queues.
Your version of SIMMAC will then run multiple SIMMAC machine language programs
simultaneously. These programs will test the ability of your SIMMAC to handle multitasking
and scheduling. You must design your system such that all SIMMAC machine
programs are loaded from text files.
The SIMMAC must be designed to take command line arguments or to prompt for input
files in addition to the previously specified items. By this mechanism, all SIMMAC
language programs will be loaded. Since there is the LDI command, all data can be loaded
into SIMMAC memory using SIMMAC programming statements.
You must develop the following SIMMAC language programs to be run on your SIMMAC
machine:
1) Write three programs in the machine language of the SIMMAC that will total the
numbers stored in 20 different locations and place the result in a single location.
7
2) Write a program in the machine language of the SIMMAC that will decrement the
value stored in location 201 (must be at least 100) by one until the result is zero.
Store the result in location 202.
3) Write a program in the machine language of the SIMMAC that will increment the
value stored in location 301 by two until the value has been increased by 200. Store
the result in location 302.
Each line of any SIMMAC program must have the following format:
Opcode Operand
You will be responsible for turning in the system design document, source code of your
version of SIMMAC (this code must be appropriately commented & readable), an
executable version of your SIMMAC, and the output generated from your SIMMAC
programs running on your version of SIMMAC. These items are to be placed in ZIP format
and submitted to the OS Problem Set Assignment in Blackboard Assignments.
The post Write a program in the machine language of the SIMMAC that will decrement the value stored in location 201 appeared first on Homework Aider.
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