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                      czx81 - A CURSES based ZX81 emulator
                         Copyright (C) 2020 Ian Cowburn
              ZX81 ROM Copyright (C) 1981 Nine Tiles Networks LTD

LICENSE
-------

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.


KEYBOARD
--------

    All normal characters should produce the equivalent character if it exists
    on the ZX81.  The emulator assumes you can generate the characters A-Z which
    will be mapped to the equivalent ZX81 key when a lower case character is
    entered.  An upper case character will generate the shifted version of the
    character as it appeared on the ZX81 keyboard.

    The cursor keys should act as cursor keys.

    The ESCAPE key will display the runtime menu.

    The following keys have the following effects:

    F1          - Emulate the EDIT key (shift 1)
    F2          - Emulate the AND key (shift 2)
    F3          - Emulate the THEN key (shift 3)
    F4          - Emulate the TO key (shift 4)
    F5          - Emulate the GRAPHICS key (shift 9)
    F6          - Emulate the FUNCTION key (shift new line)
    F7          - Emulate the BREAK key (shift space)
    BACKSPACE   - Emulate the RUBOUT key (shift 0)
    DELETE      - Emulate the RUBOUT key (shift 0)


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