Calculator.nes

This is a simple calculator ROM, meant to demonstrate various NES homebrew techniques.

The interface allows entry of two 8-bit numbers, and can add them together, without any regard for handling overflow correctly.

A unit test exists for the decimal conversion routine, and verifies that the function works for every possible input.

Controls

• Up and down on the D-pad move the cursor between the two input numbers.
• Left and right on the D-pad move the cursor to different digits.
• A and B increase or decrease, respectively, the currently selected digit.
• Start adds the two numbers together and stores the result in the sum.

Building

Install ca65 and run make. Build artifacts are kept in a directory named ".b/".

Testing

Install a lisp implementation (tested with sbcl, clisp, ecl).

Install quicklisp.

Get cl-6502. You may need to run (ql:update-dist "quicklisp") first, then (ql:quickload 'cl-6502).

Get nes_unit_testing.lisp, put it in the current directory so it can be loaded.

Run ./run_tests.sh (assumes sbcl)

Running tests the first time may be slow, due to compile times.

Windows

Install Clozure CL, then follow the above directions for cl-6502 and nes_unit_testing.lisp.

Run windows_run_tests.bat (assumes ccl)

Running tests the first time may be slow, due to compile times.