Then what Opcode games is doing for the Colecovision is just plain phenomenal.
Their Super Game Module adds some RAM and a sound channel.
This makes it almost a missing-link system, Colecovision 2.0 if you will, the stuff that bridges from the actual pre-crash era to the NES. They have an almost perfect port of Donkey Kong, and have released Moon Cresta, Goonies, Knightmare, Amidir and Gradius, with Time Pilot, Donkey Kong Jr, Jungle King, Pac Man DX and a few more coming down the pipeline soon.
Then the Collectorvision Club did Ghosts n Goblins, Demon Attack and Gyromite last year, along with ports of 1942, The Cure, R-Type and other high quality games like Ghost, Suite Macabre, Children of the Night, Zombie Incident and Chaos Begins.
I have entirely new collections of new games complete in cellophane with coverart and booklets and working cartrdges that run on original hardware. It is all pretty amazing.