Need Serial Comm port help!!!

[Jorgen Karlsson]

I think that it could be the same problem for Steve, the probably only uses
a 0v-12v swing when running on batteries, but when it is connected to ac the
full (-12v)-12v voltage is used.

Steve, have you tried connecting to the accel when the laptop is ac powered?

Jorgen Karlsson

> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Seth
> Sent: Friday, April 06, 2001 2:42 AM
> To: diy_efi at diy-efi.org
> Subject: Re: Need Serial Comm port help!!!
>
>
> 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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