Lpc2000

--- In lpc2000@yahoogroups.com, G B <microsys@a...> wrote:
>
> Richard,
> 
> I need to go from ECP to EPP.  I am wondering if my laptop's
> motherboard even supports EPP at all.
> 
> Thanks,
> 
> Glen

Most motherboards, laptops included, use a Super I/O chip of one 
sort or another.  These chips combine serial, parallel, floppy and 
sometime IDE all in one package.  I don't KNOW that your laptop will 
respond to the code but I do know that if the port doesn't show up 
at 0x378 (as an ISA port) there is no hope.  Strictly PCI ports 
can't be manipulated with the driver/setup code I use.

And, I had a heck of a time finding another ISA card for my desktop.

I would think you could look in Device Manager and find out what 
address the parallel port uses.  By default, mine uses 0x378 in ECP 
mode.  I change it to EPP when I run the logic analyzer and I don't 
think I change it back.  I don't have an attached printer, 
everything is networked.

The code is trivial:

    Public Sub PortSetup(ByVal PortBaseAddress As Integer)

        SPPDataPort = PortBaseAddress
        StatusPort = PortBaseAddress + 1
        ControlPort = PortBaseAddress + 2
        EPPAddressPort = PortBaseAddress + 3
        EPPDataPort = PortBaseAddress + 4
        ECPConfigPort = PortBaseAddress + &H402
        ECPEIR = PortBaseAddress + &H403
        ECPControl2 = PortBaseAddress + &H404

        Out(ECPConfigPort, &H94)
        Out(ECPEIR, &H2)
        Out(ECPControl2, &H10)
        Out(ControlPort, &HC4)

    End Sub
 
but it relies on a driver named 'inpout32.dll' declared as:

    Public Declare Function Inp Lib "inpout32.dll" Alias "Inp32" _
        (ByVal PortAddress As Integer) _
        As Integer

    Public Declare Sub Out Lib "inpout32.dll" Alias "Out32" _
        (ByVal PortAddress As Integer, _
        ByVal Value As Integer)

The driver is available here: http://www.lvr.com/parport.htm  Look 
about 2/3 the way down the page.

Your mileage may be all over the map...

Richard