J105 STMC

4. I/O map

The I/O map of the STMC board is given below, for jumpering as standard; i.e. with the base address as 3B0 (hex). For other base addresses (as set by LK1), simply add or subtract in multiples of 10 (hex).

	Address		Read or Write	Function
	(hex)	(dec)
	3B0	944	Read/write	Data port of stepper controller IC.

	3B1	945	Read		Status port of stepper controller IC.
	3B1	945	Write		Command port of stepper controller IC.

	3B2	946	Read		Input port (1C12)
	3B2	946	Write		Output port (1C13)

See Section 3 for details of how to change the base address of the board.