[circuitryboy]

I hope the MK14 enthusiasts look carefully at the schematic (Fig 2.1) in that SC/MP Keyboard Kit manual.
8 digits, no decimal point, (and yes, it's '157s all the way down).
So SoC actually made some enhancements. (Don't mention the keypad.)

Now National Semiconductor made calculators. Some were branded "Novus".
Here's an example; look closely at the keys.
And here's the schematic for the calculator chip inside. (I've made it more obvious.)

Can you hear that Cosmic Background hissing?