Thanks Ruben,

What you've said makes sense. I did find I could usually only get it to wor=
k =

the first time I opened the program and so I had to close it all off, open =

it up again and maybe get one more shot. I did try rebooting the machine =

often, but that wasnt any more effective  ...  just took a heap of extra =

time. :(

Thanks,  Roger


----- Original Message ----- =

From: "Ruben J=F6nsson" <ruben@pp.sbbs.se>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Friday, July 23, 2010 7:38 PM
Subject: Re: [OT] XP versus Win95 Serial ports


I have made a lot of programs that use the serialport back in the dos days. =

I
did write my own UART ISR and it worked good on dos and Win 95. But when I =

run
these programs on XP or later they don't work very well, if at all. And the
biggest problem is that sometimes when the dos program exits, the com port =

is
not released as far as windows is concerned so I can't try it again without
rebooting windows. I don't get a error message telling me what is going on
either.

Maby this is your problem also.

/Ruben



> Well, I had a go at a couple of the suggestions, but so far no joy.
>
> First I tried unchecking the FIFO buffer checkbox and several other
> variations. Then I tried the USB to serial adaptor, but again, no go.
>
> The USB adaptor certainly works, because I've used it for another
> communications job witth an RFID reader, and it worked at first attempt
> which really surprised me.
>
> I got a reasonable number of my boards going, so I'll have another attemp=
t =

> with
> the next batch.
>
> Next, I'll have to try booting into DOS via a floppy  ..  once I work out
> how it's done.
>
> Thanks for all the help.
>
> Regards,   Roger
>

-- =

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