6502 Emulator in C

Original code in C++ written by onelonecoder / onelonecoder.com

https://github.com/OneLoneCoder/olcNES/tree/master/Part%232%20-%20CPU

Find David on youtube: https://www.youtube.com/watch?v=8XmxKPJDGU0

His tutorials have inspired me to dive lower down in languages.

This C source is a nearly direct port of his code, moving from OOP to functional and adding some helper functions + a pseudo display device to hook into the bus.

All cpu_<OPCODE> + cpu_<ADDRESSMODE> functions are basically unmodified, as well as the lookup array of INSTRUCTION structs.

#Compile Download the repository and then use

sudo make makefile.dev

Use ./sfot to launch

sudo ./sfot

This program will accept:

-a Always output all items

-m Always output Memory dump

-c Always output CPU dump

-p Always output program lines

-d Always output display device dump

./sfot -a

Press enter to walk through CPU instructions. Depending on options tags, various additional elements will be output to the console.

Optionally enter a, m, c, p, d then enter to get the corresponding output element.

Use https://github.com/erbarratt/txtchartobin to convert txt files of hex numbers into a binary files that this program can read and use. If post.bin does not exist in the same directory as this file, a default Hello World program will load into the emulator memory.