wendelscardua/nes-calculator

NES calculator

NES Calculator

Scientific calculator for NES, based on http://www.crbond.com/calc65.htm and inspired by this tweet.

Usage

• D-pad: moves button cursor
• A: press a button
• B: toggles between exp and log buttons, between square and square root buttons, and between normal, inverse, hyperbolic and inverse hyperbolic trigonometric buttons.

Compiling

First, install cc65. Then run

$ make

to build the calculator.nes ROM.

Other targets are available as well:

$ make debug # will build with a DEBUG flag; for now only used for "tint" to indicate CPU usage
$ make run # will build the debug target then run on an emulator (see `EMULATOR` variable on the `Makefile`)
$ make usage # computes information about ROM/RAM usage, based on ld map output

nes-calculator's Issues

Multiplication bug

0e0 * 0e0 results in 0e1

and

0eN * 0e0 results in 0e(N+1)

Constants

Maybe add buttons (or a second input area) for common constants like pi or e.

Exponent input

For now only the mantissa can be inserted (the exponent depends on when the decimal point is inserted).

"Delete" (aka backspace) button

There's even a button reserved for this function (between "." and "="), but it's not trivial to implement it with the current input logic.