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

How often the state of the input pin can be checked is going to be dictated by the speed of the serial transfer.
At 115200 baud that would be about 11520 times a second.

The code would be very simple:
--------------------------------------------------------------------
DEVICE SX28, OSCHS3, TURBO, STACKX, OPTIONX
FREQ 50_000_000

InPin VAR RB.0 ' Change this to whatever pin you want to monitor
SOutPin VAR RB.1 ' Change this to whatever pin you want serial output from

Temp VAR BYTE

PROGRAM Start

Start:
  INPUT InPin
Again:
  Temp=InPin
  SEROUT SOutPin, N115200, Temp
  GOTO Again
-----------------------------------------------------
Bean.

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