BTW, the example in the Instruction Descriptions of the 886 datasheet
is a great big hairy clue

Example: MOVWF OPTION

Before Instruction

OPTION = 0xFF
W = 0x4F

After Instruction

OPTION = 0x4F
W = 0x4F

Surely every programming language is similar and doesn't destroy source values

A = 10
B = A
C = A
D = A

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