POKE                     Write Byte to Memory

 POKE address,byte

    Writes a specified byte at a specified memory offset within the
    current segment.

     address    A numeric expression in the range 0 to 65535; specifies a
                decimal offset within the segment specified by the most
                recent DEF SEG statement.

        byte    A numeric expression in the range 0 to 255; specifies the
                data to be written at offset address.