A Magnavox Odyssey 2 and Philips Videopac emulator, written from scratch around an Intel 8048 and an 8244/8245 display chip ported from MAME. The video chip is driven a scanline at a time and honours the beam, so the games that turn their objects off mid-frame to rewrite them, and the grid the console draws its playfields with, come out the way the hardware makes them rather than the way a whole-frame renderer would guess.
It needs no console ROM. The BIOS is emulated at the high level instead: a decompilation of the routines the games call, proven equivalent to the original before it was adopted. The copyrighted 1K system ROM and its 512-byte character generator are therefore never required and never shipped. Cartridges load as .bin or .rom, including the exec-ROM titles that answer a second ROM on the external bus.
Both consoles are covered: the NTSC Odyssey 2 and the PAL Videopac differ in their dot clock and their raster, and the region is taken from the cartridge or forced by hand. Sound is synthesised band-limited from the shift register that produces it. The console keyboard is mapped in full, and either controller can drive both ports for the many titles that only read one.
Available on Windows, Linux, macOS, Android, iOS, and WebAssembly. Shale is plain, portable C11 with no exotic dependencies, so a port to video game consoles is well within reach. Contact us if that is of interest.
Commercial games running unmodified on Shale, shown to demonstrate compatibility.
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This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.
12. If the distribution and/or use of the Library is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Library under this License may add
an explicit geographical distribution limitation excluding those countries,
so that distribution is permitted only in or among countries not thus
excluded. In such case, this License incorporates the limitation as if
written in the body of this License.
13. The Free Software Foundation may publish revised and/or new
versions of the Lesser General Public License from time to time.
Such new versions will be similar in spirit to the present version,
but may differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the Library
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14. If you wish to incorporate parts of the Library into other free
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NO WARRANTY
15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
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AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Libraries
If you develop a new library, and you want it to be of the greatest
possible use to the public, we recommend making it free software that
everyone can redistribute and change. You can do so by permitting
redistribution under these terms (or, alternatively, under the terms of the
ordinary General Public License).
To apply these terms, attach the following notices to the library. It is
safest to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.
<one line to give the library's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see
<https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the library, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the
library `Frob' (a library for tweaking knobs) written by James Random Hacker.
<signature of Moe Ghoul>, 1 April 1990
Moe Ghoul, President of Vice
That's all there is to it!
Public Domain
-------------
The components listed above have been released into the public domain by their
authors, without conditions. They may be used, copied, modified and distributed,
in whole or in part, for any purpose.
Who released each of them, and where that release was made, is recorded with the
component above.