ICSI 404 – Assignment 5 – memory & computer setup

This assignment builds on the previous assignment.

Part 1

Now that we have an ALU, we need to add some memory to build
the next portion of our computer.

Build a class called “memory”. Unlike the ALU, the
rippleAdder and the multiplier, the memory needs to have state (members). It
should have the following method calls:

public longword read(longword
address)

public void write(longword
address, longword value)

You must hard code the amount of memory our computer will
have – 1024 bytes. The storage must be constructed from our existing bit class.

You must provide a test file (memory_test.java) that
implements void runTests() and call it from your main, along with your existing
tests. As with the other tests, these tests must be independent of each other
and there must be reasonable coverage. You cannot reasonably test all of the
billions of possible combinations, but you can test a few representative
samples.

Part 2

With memory and an ALU, we can start working on building a
functional CPU.

Start by creating a class: computer.

Add a bit to indicate if the computer is halted or not. This
should default to NOT running (for now).

Create a void run() method that runs a while loop until the
halted bit indicates that the computer should not run anymore. Within this
loop, four methods needs to be called:
void fetch(), void decode(), void execute(), void store(), in that order.

Add a memory member (private) to your computer.

There are no tests that we can reasonably run on your
computer yet.