LM80C Javascript emulator

A JavaScript emulator for the LM80C computer by Leonardo Miliani.

Open the emulator directly in your browser: lm80c-emu

LOADING AND SAVING FILES

• prg files (.prg) are plain files that are loaded in memory as-is

Dragging & dropping a 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) via the LM80C serial line

DEBUGGER

You can plug your own Javascript debug functions by defining debugBefore() and debugAfter(elapsed) in the JavaScript console.

debugBefore is executed before any Z80 instruction; debugAfter is executed after.

To activate the debug mode use lm80c_set_debug(true) and lm80c_set_debug(false)
to deactivate it. Within the debug functions you can access all the emulator variables, most likely you'll want to read the Z80 state with cpu.getState() or the memory content with mem_read() and mem_write().

START WITH A DIFFERENT FIRMWARE

To select a different firmware than the latest one, use the querystring parameter rom, e.g.:

https://nippur72.github.io/lm80c-emu?rom=314

to start with firmware named "LM80C-firmware-r314.rom"

AUTOLOADING

The emulator can be used in cross-development allowing to automate the process of loading and executing the program being developed. This will save lot of annoying drag&drops.

To enable "autoload":

• clone the emulator on your local machine (it won't work in the online-version because of browser restrictions)
• in your compile chain (make etc..), copy the binary you want to execute in the emulator directory naming it autoload.bin
• execute node makeautoload, this will turn autoload.bin into JavaScript code (autoload.js).
• refresh the browser, the program will be loaded in memory and make it RUN

When you no longer want the file to be autoloaded, delete autoload.bin and run again node makeautoload.