Re: [CAD_CAM_EDM_DRO] Re: Compters without printer port

Stephen Wille Padnos wrote:

>>> The most likely explanation to me is that the BOB looks like some sort
>>> of EPP or ECP device, but when the driver can't get it to reset or
>>> initialize, it disables the port. This might make sense when the
>>> expected use of a parallel port is to communicate with things like
>>> printers and scanners. It may also be an issue if the thing connected
>>> to the interrupt input is in the "wrong" state while Windows is booting.
>>>
>> Certainly in my own case, the BOB is specifically deigned to draw almost no
>> current. Some breakout boards that hang opto isolators directly on the parallel
>> port will not work with ITX and other 'set top' style motherboards, so I've gone
>> for a low current buffer as the very first stage.
>>
>> The fact that W2k boots fine and XP doesn't point to an initialization problem
>> with windows rather than any hardware problem. ANd as I say - leave the cable
>> out - start XP - plug in. Then no problem either.
>>
> Sure, that's compatible with my explanation. The XP driver may be more
> paranoid than the 2k driver when it has problems initializing external
> hardware, or can't determine what the hardware is.
>
> It's likely that one (or more) of the inputs that end up in the status
> register is the problem. These are pins 10-13 and 15 on the port
> connector. You might try disconnecting each of those and rebooting. At
> some point the machine will boot up, and you can start reconnecting them
> (leaving the last one disconnected). You should be able to find out
> which of the inputs is the problem.
>
> This is all assuming that I'm right ;)

I'm sure you are, but it's one of those jobs that will have to wait until I've
finished the time machine ;)

With Windows 7 needing testing as well now, there are just not enough hours in
the day. But at least W7 fails to install on the ITX boxes at the first hurdle
so I am 'stuck' with W2k for them anyway :)

--
Lester Caine - G8HFL
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