A Magnavox Odyssey 2 and Philips Videopac emulator with an Intel 8048 CPU and an 8244/8245 video chip. The video chip is emulated one scanline at a time, following the beam, so games that switch objects off mid-frame to reuse them, and the grid the console draws its playfields with, look as they do on real hardware.
No console ROM is needed. The BIOS is emulated at a high level instead: the routines games call were decompiled and checked against the original before being used, so the copyrighted 1 KB system ROM and its 512-byte character set are never needed and never shipped. Cartridges load as .bin or .rom, including exec-ROM titles that use a second ROM on the external bus.
Both versions of the console are supported. The NTSC Odyssey 2 and the PAL Videopac have different dot clocks and screen timings, and the region is taken from the cartridge or set by hand. Sound is band-limited and generated from the same shift register the hardware uses. The console keyboard is fully mapped, and one controller can drive both ports, which helps with the many games that only read one.
Available on Windows, Linux, macOS, Android, iOS, and WebAssembly. Shale is written in plain, portable C11 with no unusual dependencies, so porting it to game consoles is straightforward. Contact us if you are interested.
Unmodified commercial games running on Shale.
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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
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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.