A breakthrough!
I realised that the only unique thing about the laptop that works is the
fact that is has an old HP Laserjet 4 attached (and consequently its driver
which specifies LPT1 as the port) when I set up this driver (but no printer
attached) on my XP Home PC the dongle checking code now works (I haven't
checked it with the dongle as its at work but I'm sure it will be OK).
If I then disable the HP, or specify another port, the dongle code then
freezes again so for some reason it needs this hardware link.
Incidentally the printer queue for the HP shows 40 single byte print jobs
when the dongle program starts but I can live with that.
Thanks for your help
"Al_change_little_to_big" <(E-Mail Removed)> wrote in message
news:f5-(E-Mail Removed)...
> Hi,
>
> the port on the laptop (which works) is set to ECP
>
> the port on the desktop with the same drivers (which doesn't work) is also
> set to ECP
>
> "Cari (MS-MVP)" <(E-Mail Removed)> wrote in message
> news:%(E-Mail Removed)...
>> What is the parallel port set to in the BIOS? EPP, LPT or something
>> else.
>> --
>> Cari
>> (MS-MVP Printing & Imaging)
>>
>> "Al_change_little_to_big" <(E-Mail Removed)> wrote in message
>> news:(E-Mail Removed)...
>>> Always nice to start with some alliteration
>>>
>>> I have a parallel port dongle for some old 16 bit SCADA software
>>> (intellution fix v5.6) and this works fine on a Dell latitude laptop
>>> running XP pro.
>>>
>>> When I came to try it on desktop PC's the SCADA startup screen freezes
>>> when trying to access the dongle.
>>>
>>> One of the desktops is running the same version of XP Pro and uses the
>>> same parallel port (and ParVDM.sys) file. The other a running either xp
>>> pro sp1, xp pro sp2 or xp home sp2.
>>>
>>> If I disable the parallel port in Device Manager the startup screen is
>>> fine and reports that the dongle is missing (and allows demo mode to
>>> run)
>>>
>>> I've tried altering BIOS settings and driver settings (use interrupt
>>> etc) but to no avail
>>>
>>> I also tried using user port drivers (PortTalk, UserPort) but I suspect
>>> part of the problem with them may be that the startup screen then loads
>>> DLL's or other exe's
>>>
>>> I've contacted Intellution (the SCADA programmers) and they just said
>>> sorry our stuff doesn't run on XP unless you give us £10,000 for our
>>> nice new one.
>>>
>>> Any ideas anyone?
>>>
>>> Info
>>>
>>> Dell latitude - this one works
>>>
>>> XP Pro V5.1 build 2600 xpclnt_qfe 010827-1803
>>>
>>> parport.sys Version 5.1.2600.0 xpclient.010817-1148
>>>
>>> parvdm.sys Version 5.1.2600.0 xpclient.010817-1148
>>>
>>>
>>> Dell optiplex GX260 - this one doesn't work
>>>
>>> XP Pro V5.1 build 2600 xpclnt_qfe 010827-1803
>>>
>>> parport.sys Version 5.1.2600.0 xpclient.010817-1148
>>>
>>> parvdm.sys Version 5.1.2600.0 xpclient.010817-1148
>>>
>>>
>>>
>>>
>>
>>
>>
>
>
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