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There are two versions of the card. One has a long blue connector (looks like an internal IDE connector) and the other one has a shorter black connector (looks like a PC floppy connector). The connectors, I don't think were ever used.
The blue connector card is newer. The black connector card is older.
The blue connector card is newer. The black connector card is older.
Actually, Mike, the connectors were used. The older ones (Rev. A/B, from memory), had the shorter connector for use with the Apple MPEG System (an LC PDS MPEG Decoder). The newer ones (Rev. C/D from memory) had the longer connector which was used with the Avid Cinema card that was an optional extra for the 6400, if i recall.