In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Well, SXLIST [www.sxlist.com] is definitely the right place to get started.  

I suspect that Mary wants to multiply 8 bits by 8 bits which gives 16 bit results.  And Calculator may be a misnomer, she might want to demonstrate binary operation of math calculations.  

It does seem that she should consider having 16 leds though.  That would require she use an SX-48 to have enough i/o.  Of course she could keep the 8 leds and display a high and low byte sequentially and stay with an SX-28.

With a DIP switch, this is certainly not going to be an infix or RPN calculator.  That would require 10 numeric keys AND four function keys AND an equal key AND a clear [is that 16 keys?]

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