This is a javascript version of corewars8086

https://shooshx.github.io/corewars8086_js/war/page.html

Features include:

• assembler, runner and debugger compiled to javascript
• integrated nasm assembler that runs as you type code
• easy management of players
• step by step debugger
  • allows editing of registers on the fly
• disassembly of code as it is executed
• breakpoints in code
• ability to set the program load address manually in the debugger
• view of the stack and shared memory
• watch view with full featured watch language
  • all operators: +,-,*,/,%,|,&,~,**(power)
  • all operations are 16 bit math
  • register access by the names
  • memory access using square brackets
    • [bx] to access byte,
    • [bx]w to access a word,
    • [ds:bx] to access fully qualified address
  • numbers in hex (0xA3F), binary (0b110111) and octal (0o14427)
• zoomable memory canvas
  • show memory content at zoom factor 4
  • edit memory content in canvas by setting a cursor with a click
  • move the cursor using arrows and scroll around
• it is possible to inspect the state of warriors in the debugger after a war is over and even continue running the war with just the winner running.
• implementes all features of the original Java GUI
• Load a batch of survivors or zombies binaries from a zip file
• load and save all players code from and to a json file
• Change the size of panels layout using splitters
• Options in menu:
  • reset the layout to its default state
  • move the players panel to be on the left (for wide screens) or at the top (for 4:3 screens)
  • Open options dialog
  • clear all current players, reset to initial test players
• Options in options dialog
  • change the width of the memory display for better visibility
  • Alternate opcode colors for better visibility of where opcodes start and end in the memory view
  • enable register pointers pointing to the memory canvas
  • enable Auto-save state. when enabled the editor state is saved to localStorage and loaded on page reload
• Competition: run many games one after the other with the same set of warriors
  • Copy the textual table of result
  • Detailed control over the visualization of competition graph
    • change orientation, sorting, name apperance, rank numbers

tips and tricks

• When debugging, you can always return to a warrior running point by clicking its name on the left pane
• You can set value of any register manually by writing a value in its box. This includes IP and Flags registers.

Coming up features:

• data breakpoints
• fixed randomization bug
• online competition

references:
https://codeguru.co.il/Xtreme/
https://github.com/codeguru-il/corewars8086
https://github.com/YoavKa/corewars8086 (disassembler)
https://github.com/kimwalisch/calculator (watch language)
nice disassembler: https://onlinedisassembler.com/odaweb/