I bought a Tandy EC-21 Calculator/Blackjack game (http://www.handheldmuseum.com/Tandy/Blackjack21.htm) because the instruction manual and patent had a few similarities that I thought were more than coincidence. They both automatically shuffle when the 38th card is dealt, and the first example game in the manual is almost identical to the example game in the patent. But the chip in the Tandy unit is an NEC D1021C, and the die looked completely different. I also cracked the die into 3 or 4 pieces, so I pretty much gave up on it.
