I did a patent search on Commodore in 2009
Amiga Inc AGA patents?Apple tries GUI patents in 2010
Apple Awarded Patent on The DockSo for FPGA Arcade and similar projects (A1200 - 1992):
* 1984 CPU: Motorola 68020
* 1985 I/O: MOS 8520
* 1985 Sound: Paula
* 1992 Graphics: AGA, Alice, Lisa
The other feature chipsets are Ranger (1987), AAA (1992), Hombre (1993). So any project involving the Hombre chipset may have to lookout. And ROM/floppy stuff is still in copyright.
(AA+ = paper product)
Spare parts list,
A1200 techPatent expire in USAIn essence: Any patents that may exist, expires in 2012