Epple-II calls the Simple DirectMedia Layer (SDL) library,
available here: https://www.libsdl.org/ .



For the analogtv class, portions were inspired by Trevor Blackwell's analog
TV module for xscreensaver. For those portions:
/* analogtv, Copyright (c) 2003, 2004 Trevor Blackwell <tlb@tlb.org>
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation.  No representations are made about the suitability of this
 * software for any purpose.  It is provided "as is" without express or
 * implied warranty.
 */
Thanks, Trevor, for your code and your inspiration.



The ADC and SBC instructions of the CPU class were based on those taken
from Verhille Arnaud's POM1 Apple 1 emulator. For those portions:
// Copyright (C) 2000, by Verhille Arnaud, GPLv2 license.
Thanks, Verhille.