[no subject]

The 7 pin header is the Apple IIc Plus expansion connector and adds some extra
signals missing from the IIc memory expansion connector.

1	RA14	ROM address line 14
2	INH*	Memory inhibit line
3	EN80*	Enable auxiliary RAM
4	ROMEN1*	Enable ROM
5	A3	System address bit 3
6	A2	System address bit 2
7	BUSEN*	Indicates valid access to MIG address space

The other 7 pin connector supports an internal modem:

1	-5V	-5 volts
2	RXD	Receive Data
3	TXD	Transmit Data
4	DCD	Data Carrier Detect
5	DTR	Data Terminal Ready
6	DSR	Data Signal (sic) Ready (should read Data Set Ready)
7	GND	Ground

I suspect that the memory connector is the one adjacent to the standard memory
connector while the modem connector is near the power supply.

>Anyone knows link to a page or document with an in depth description of the 
>IIc plus board ? I couldn't find one searching on the web.

The Apple IIc Technical Reference (2nd edition) is the definitive source
but is not available online AFAIK.
-- 
David Wilson  School of IT & CS, Uni of Wollongong, Australia