Having failed to deliver the real Keyboard Component, the Entertainment Computer System add-on was produced to settle looming lawsuits and stop fines being imposed by the FTC (see the Intellivision Lives site for the full story). I'm still saddened by that. I really, really wanted that computer.

It seems that there were also Intellivision, Inc. releases of the ECS software, but I don't know the complete list. The only three I know of (either that I own or have seen on various web sites or eBay) are Mind Strike, Mr. Basic Meets Bits 'N Bytes, and Super Series Big League Baseball, the repackaged version of World Series Major League Baseball. If you've seen any others, let me know!

Entertainment Computer System Software
Title		Item No.	Manual	Overlays	Rarity	Notes
	Jetsons' Ways with Words	4543	Yes	2	ER1	Beautiful shape; game review / info
	Melody Blaster	4540	Yes	2	ER2	"Book"-style box: shrinkwrap removed Dec. 2000; "flap" style box also near mint; requires Music Synthesizer hardware; two versions of errata slip; game review / info
	Mind Strike	4531	Yes	2	ER2	Game review / info
	Mr. Basic Meets Bits 'N Bytes	4536	Yes	6	ER2	Separate overlays for three different games—all six must be present to be considered complete; game review / info
	Scooby Doo's Maze Chase	4533	Yes	2	ER2	Shrinkwrap cracked in June, 2001 - pristine; game review / info
	World Series Major League Baseball	4537	Yes	2	ER2	Shrinkwrapped until Feb. 2001 (yes, I do crack shrinkwrap on old games!); ECS required, IntelliVoice optional; game review / info