7406 / 7407

These are open drain gates that will accept a 5V logic input
and output whatever voltage you wish. Often used for logic-
to-motor/sensor/etc. They function in a similar way to Porta.4
on the F84/628

Those that you want to read, simply set their output voltage
to 5V, and limit their inputs to 5V with a zener or resistive
divider. Those that you want to drive can be done so directly
and their outputs will assume the voltage (12V) that you
pull them up to

They are very useful ICs. Read the spec sheet here

http://www.philipslogic.com/products/buffers/06/

Some others you could consider

http://www.philipslogic.com/products/levelshifters/

Bookmark this

http://www.philipslogic.com/products/

Other options would be the micro-to-PC interface chips such
as MAX232, MC1488/1489 derivatives, or any of the level
shifters used in comms circuits

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