1. Various Contributors
    sz81 is a Sinclair ZX80/ZX81 emulator very much based upon the work of Ian Collier's xz80 and Russell Marks's z81 but employing the highly portable SDL and including additional functionality and features for desktop computers and portable devices.

    Features (not GP2X specific):
    - Virtual keyboard with several adjustable properties
    - Control bar with icons for regularly used features
    - Load anytime file dialog (no need to use LOAD)
    - Save state system with 9 slots for each program
    - Runtime options including a joystick configurator
    - RAM configurations of 1 to 4, 16, 32, 48 and 56K
    - Quicksilva, BI-PAK ZON X-81 and VSYNC-based sound
    - Screenshot saving using the bitmap image format
    - Joystick control remapping within the emulator
    - Full keyboard, mouse and joystick support throughout
    - 3x runtime switchable scaling on supported platforms
    - Window and fullscreen toggling on supported platforms
    - Portrait orientated resolutions such as 240x320
    - The ability to run centred within any resolution
    - Source code support for *nix, AmigaOS4 and Win32
    - Maximum porting potential since it only requires SDL

    * 2.1.7 released
    * Added forced (non-LOAD) program loading via a load file dialog
    * Added a save state system for saving and loading sz81 save states
    * Moved command-line emulation options to GUI runtime options
    * Added support for 1 to 4, 16, 32, 48 and 56K RAM (UDG now works)
    * Added the ability to save screenshots via PrtScn (SDLK_PRINT)
    * Added support for o, 80, p and 81 program file types
    * Added autoloading of ZX80 program files in addition to the ZX81
    * Added sequential filenaming for ZX80, printer and screenshot files
    * Added a ZX80 BASIC xxxx REM SAVE 'progname' filenaming hack
    * Added an emulator pause feature via Pause (SDLK_PAUSE)
    * Added mouse wheel support, used within the load file dialog
    * Added a machine code PipePanic game and a machine code template
    * Added the GNU GPL'd Open80 and Open81 source code and ROMs
    * Added Win32 support via the _WIN32 preprocessor macro
    * Applied several graphical and usability tweaks
    * Fixed a couple of bugs

    The package here within the archive is built using the Open2x toolchain, but the GPH version is additionally available from the project's website.

    The ZX81 game in the screenshot is Kong by Paul Farrow.