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

The SX/B NOT operator in 1.51.02 has a problem.  When both the operand and the result are array elements, the assembly code generated by the compiler inverts the operand twice.  

Here's the code I used to confirm this:

ByteArray	VAR Byte(2)
Element0	VAR ByteArray(0)
Element1	VAR ByteArray(1)
...

Element0 = 0
Element1 = 0
Element1 = NOT Element0

This code leaves Element1 with a value of $00, not $FF as expected.

Of course a simple work-around is to add a non-array byte variable, such as Temp:

Temp = Element0
Element1 = NOT Temp

I also noticed that "NOT" and "~" are not shown in bold in the basic editor.  I believe that's because they aren't listed in RESERVED.TXT.

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