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

The RANDOM function is SX/B is very simple, yet has good distribution only repeats after 256 iterations.

; seed = seed * 5 + 123

Random
  MOV W, seed
  ADD seed, W                 
  ADD seed, W                  
  ADD seed, W                 
  ADD seed, W                  
  ADD seed, #123
  RETP

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