Gathered notes relating to the actual hardware of the pc8201.

These notes were compiled from sources on the net
//FIXME - reference some of these sources.
and were used during the writing of the xmess/xmame driver for the pc8201.


Memory Map
----------

0000-7fff	System ROM (bank rom0)
8000-ffff	System Ram Area
 8000-bfff	Expanded 16K RAM
 c000-ffff	Base 16K RAM

TODO - discover/document Bank switching address details

xxxx-xxxx	Expansion ROM (bank rom1)
xxxx-xxxx	Expansion RAM (banks ram2-7)

Port Map
--------
70		8255 portA (optional)
71		8255 portB (optional)
72		8255 portC (optional)
73		8255 command/mode (optional)

80 		ROM Expansion address/select
84		ROM Expansion address
88		ROM Expansion address
8C		ROM Expansion Data

90		IO control port
A0		"Return status of IOCNT"
		"Current bank number stored here"
		m100 - "Modem control port"
A1		"Printer strobe"
		"used to set the current bank"

B0-B5		same as B8-BD
B8		8155 Command/status
B9		8155 portA
BA		8155 portB
BB		8155 portC
BC		8155 timer LO
BD		8155 timer HI

C0-C8?		6402 TX/RX
D8		6402 Command/status

E0-E8		Keybord matrix read

F0-F1		same as FE-FF
F2-F3
F4-F5
F6-F7
F8-F9
FA-FB
FC-FD
FE		LCD command/status
FF		LCD Data


IO control port
---------------
Bit
 0	Bank #0 select
 1	Bank #1 select
 2	Bank #2 0000-7fff select
 3	Bank #3 8000-ffff select
 4	Clock "strobe"
 5	Cassette motor
 6 \
 7 -	Serial interface
		00 
		01 Ram file
		10 F/D interface
		11 Rs232 COM port

8155
----
	Command = 0x43

portA
-----

Printer data output
keyboard strobe
LCD chip select

clock data
----------
Bit
 0	C0
 1	C1
 2	C2
 3	Clock
 4	serial data to clock

portB
-----
 0	LCD block select 9	(column 9 keyboard - m100 only?)
 1	LCD block select 10
 2	Buzzer from timer (0 - 8155 timer output, 1 - no noise from timer
 3	Select Carrier detect (0) or RING detect (1)
	0 - Rs232, 1 - Modem (m100 only?)
 4	Software off switch
 5	Buzzer data bit.  0 - no noise, 1 - buzzer active if bit2=1, else allow
	timer control
 6	DTR output (active low)
 7	RTS output (active low)

portC
-----
 0	clock data input
 1	Printer select input (active low)
 2	Printer busy input
 3	Bar code reader input
 4	CTS input (active low)
 5	DSR input (active low)

Timer input

Timer output


6402
----

clocking input

interupt output

Read Status:
	PE
	FE
	OE
	DR
	TRE
Write Command:
	PI
	SBS
	CLS2
	CLS1
	EPE

8085
----

SID	cassette
SOD	cassette

Modem Control Port - m100 only?
------------------
Bit
 0		Telephone relay (1 is off-hook or connected to phoneline)
 1		Modem enable