Simon Holdsworth's JtyOne ZX81/ZX80 Emulator

The JtyOne emulator is a port by Simon Holdsworth of Mike Wynne's original EightyOne emulator.

The emulator covers all of the functionality of the ZX80 and ZX81, including accurate timing of the display update to support the high resolution graphics tricks some programs used.

The emulator applet can be pointed at a .TZX file that contains the program to load, otherwise you just get a vanilla ZX81 on which to write and run programs (but not save from an applet!)

You may need to click on the applet to enable keyboard entry.

The Emulator Applet

Here you can see an example of the emulator in action. This one does not have a ZX81 file linked to it, so you'll have to be creative...

The applet supports the following parameters:

scale

Scaling factor for display; use 1 or 2

machine

The machine, values are ZX80 and ZX81

tzxFileName

The name of the .TZX file to load, if any

hires

The high-resolution hardware to include, values are qs and dk or omit for no hardware high resolution

Java Source (v1.1)

The source for the applet is available under the GPL, as required by the EightyOne source. You can download it from here.

Use on Other Web Sites

Please feel free to use the emulator on your web sites; I'd appreciate a mention and a note that it is a port of Mike Wynne's EightyOne emulator.