I/O-adresses

$D12x   6551    (thanks to Rene de Bie)

$D170	VIA	PORTB	status
		bit 0	SCSI I/O	in
		bit 1	SCSI C/D	in
		bit 2	SCSI SEL	out
		bit 3	SCSI RESET	out
		bit 4	CENT BUSY	in
		bit 5	CENT FAULT	in
		bit 6	SCSI BSY	in
		bit 7	SCSI REQ	in	
$D171	VIA	PORTA	data (Printer/SCSI)
$D172	VIA	DDRB
$D173	VIA	DDRA
$D174	VIA
$D175	VIA
$D176	VIA
$D177	VIA
$D178	VIA
$D179	VIA
$D17A	VIA
$D17B	VIA	
$D17C	VIA	
		CA1	SCSI REQ
		CA2	SCSI ACK
		CB1
		CB2
$D17D	VIA
$D17E	VIA
$D17F	VIA

$D18C	PIA	Mirror
$D19C	PIA	Mirror
$D1AC	PIA	Mirror

$D1BC	PIA	PORTA	RAMPAGE
$D1BD	PIA	
		CA1	
		CA2	
$D1BE	PIA	PORTB	SWITCH
		bit 0	dump type
		bit 1	HD write protect
		bit 2	HD port enable/ ROM adress 13 (V2.16)
		bit 3	printer port enable
		bit 4	RS232 port enable
		bit 5	enable printer LF
		bit 6	printer is Prowriter
		bit 7	MIO comp. mode
$D1BF	PIA	
		CB1
		CB2
$D1C0	240	SENSEL
		bit 4	SCSI MSG
		bit 5	RS232 DSR
		bit 6	RS232 CTS
		bit 7 RS232 CD
$D1C1	240	Mirror (-$D1FE)
$D1FF	240	PDVS (Mirror of $D1C0)
		read interrupt source
		bit 0	
		bit 1	
		bit 2	HC switch
		bit 3 menu switch
		write	bank select
		$04	disk routines