Format of HP 95LX communications settings:
Offset	Size	Description	)
 00h	BYTE	dial type ('T' tone, 'P' pulse)
 01h	WORD	baud rate divisor (115200/baud_rate)
 03h	BYTE	parity (00h none, 08h odd, 18h even, 28h mark, 38h space)
 04h	BYTE	stop bits (00h one, 04h two)
 05h	BYTE	data bits - 5
 06h	BYTE	software handshake
		01h none, 02h XOFF/XON, 04h XOFF/any, 08h ENQ/ACK
 07h	BYTE	infrared (01h off, 02h on)
 08h	BYTE	duplex (01h half, 02h full)
 09h	BYTE	echo (01h echo, 02h no echo)