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My first was a TI99

I too was always jealous of my neighbour with the Commodore
Source

Now, you have me thinking ...

The first game I can remember playing obsessively was Alpiner

and I remember my mother getting hooked on Munch Man

If you feel like playing these on your PC, they can be found here as well as an emulator http://mntnweb.com/oldcomputers/ti994a/ti994a.htm