VIC20 Javascript emulator

A JavaScript emulator for the VIC20 computer.

This emulator is based on the amazing work of Andre Weissflog

https://github.com/floooh/chips-test https://github.com/floooh/chips-test

Copyright (c) 2017 Andre Weissflog

Open the emulator directly in your browser: vic20-emu

QUERYSTRING OPTIONS

• config=n sets memory config (n=0,1,...)
• joy=1 emulates joystick
• load=program.prg loads and exectutes a program
• b=<....> loads the specified string as a base64 binary encoded file (created with the function makeBase64())

LOADING AND SAVING FILES

• prg files (.prg) are common VIC-20 program files that are loaded in memory. The first two bytes contain the loading address.

Dragging & dropping a ".prg" file on the emulator's window causes the file to be loaded.

Once a file is loaded, it's also stored on the browser cache so that you don't have to drag&drop it again; you can use the load() function from the JavaScript console.

These are the commands you can type from the JavaScript console (F12 key):

• load("file.prg" [,start]) loads a file at the specified address
• save("file.prg" [,start, end]) saves a file
• download("file.prg") gets the file as a browser download
• remove("file.prg") remove file from browser's cache
• dir() lists files on browser's cache
• paste(text) paste a string of text (e.g. containing a BASIC program)
• makeBase64("file.prg") encodes the file for use with the b= query string parameter (see)

MISC

• vic20.config(n) configures memory (n from 0 to 5)
• vic20.reset() resets the VIC20 (also via CTRL+ALT+BREAK keys)
• vic20.peek(address)
• vic20.poke(address, data)