Need Serial Comm port help!!!

[Seth]

With my presario(2400), the serial port won't work unless it is on A/C
power. On battery it won't communicate with my (Siemens) EFI.  BTW, it
is a Pentium 100 non MMX

-Seth



"Flanagan, Steve" wrote:
> 
> I recently upgraded my laptop to a Compaq presario 1200.  My intention was
> to
> get rid of my 50Mhz old machine and have something that runs windows.  I use
> this laptop at the racetrack to run my data recording software (windows),
> MSD
> software (windows) and my Accel DFI software (DOS).
> 
> The problem I have (and Accel will not support) is that the newer laptop
> will not
> connect to the DFI.  I have changed the baud rate to match the rate of the
> older
> 50Mhz machine,  same stop bits, same parity.  Not sure which flow control so
> I tried
> all three (xon/xoff, hardware, none). I even lowered the size of the
> buffers.  After
> many configurations and attempts my result was still failure.  I even tried
> slowing
> down the newer PC to match the performance of the 50MHz machine.  I have
> started in
> Dos mode also.
> 
> My dilemma is the old PC is on its last legs, and I need to make the newer
> PC communicate
> with the DFI.
> 
> Does anyone have any ideas, above and beyond what I have already done to get
> my new
> PC to link to the DFI?
> 
> Does anyone know what is different between older serial ports (on an IBM
> 50Mhz machine)
> and the newer (500Mhz + machines)?????
> 
> Can a device be built that will let the newer serial port work the same as
> the older
> serial port????
> 
> Thanks for you help.
> 
> PS: please reply both to the page and directly to me, I am not on the efi or
> gmecm lists
> any more, just the diy list.
> 
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