FORSH Interpreter

(My take on writing a FORTH interpreter): to run it, copy assembly code from mos.txt into the textbox, hit Assemble, then Run

Because of the way input is handled in 6502js, some of the input controls for the text console are a little janky:

• \d to backspace:
• \c to clear the line
• \e for enter
• \h for help

The shell is a FORTH interpreter written by me. Try entering the following commands (use \e instead of enter)

• 1 2 push some numbers onto the stack
• .S show the stack contents
• 3 * + . multiply by 3, add, then pop and print the top of stack

6502js

I built this on top of the following 6502 simulator I found: https://skilldrick.github.io/easy6502/ (which this repo is a fork of). Most of the code I wrote is in mos.txt and dict.txt, but I did end up extending the simulator/assembler with a few features that made debugging my project easier:

• define statements
• arithmetic (ie label+2)
• Added label and arithmetic parsing to the debug memory monitor, disassembler, PC display for easy of debugging
• Doubled the size of the simulated screen to be able to write a somewhat usable amount of text