[DSP-10] additional testing of UHF3 / UHFA / XP

[Roger Hayward]

Mike:

This experiment was presented to the DSP-10 group way back in August 2007.
I stumbled across the code-change while trying to get a full-blown windows
port running.  I found the same timing issue with the control program ported
under windows.  Once I cracked the issue open, the motivation to complete
the windows port seemed somewhat futile.  (One of the underlying goals was
to not branch the code away from Bob's code base....so seeing Bob's
application run native under DOS was deemed a better feature to keep than to
earn the dubious job of maintaining a windows port for the next 10-20
years!)

Quite literally, the only change to the UHF3_33x code is in about 2 lines of
code.  Bob's UART receive code is very unforgiving.  He complies to the
written RS-232 specification.  Unfortunately MS-Windows method for handling
the double-buffers of the RS-232 does NOT fully comply the specification.
So the forgiveness timers in the DSP board were extended from microseconds
to milliseconds, which gave Windows the time to complete a context switch
between characters.  Something like that.

I encountered some of the similar nuances you have experienced, but did not
chase them down very far.  We have binaural exciters at home this year, so
that is taking quite a bit of our bandwidth this year.
http://picasaweb.google.com/ka7exm .

73 for now.  Thanks for finally noticing the code and checking it out.

  Roger KA7EXM






On Thu, Dec 18, 2008 at 9:24 PM, kd7ts <kd7ts at aceweb.com> wrote:

> I let the box run for about 3 hours, tested everything I could think of,
> and all seems fine.
>
> After shutting down the UHFA program but leaving UHF3_33x running, it did
> not want to
> start again. I had to remove power from the DSP-10 box and let it boot from
> the eprom,
> and reload using the batch file from the floppy. Then everything was OK
> again.
>
> I tried using windows 98 also, but this required some effort to get going.
> There seems to
> be some issue with getting the pointers. After UHF3_33x was loaded, I just
> kept
> hammering on UHFA, and it finally got the pointers.
>
> Next trial was just using UHF3_33x and UHFA in DOS which works normally.
>
> Since I have laptop computers dedicated to DOS I will continue in the same
> old fashion.
>
> W7LHL also tried XP and Vista. XP worked fine, and it appears Vista might
> work, but there
> is some issue with the screen driver. Ernie has a wide screen. Everything
> loads, so the
> com port seems to be OK, it just doesn't like the wide screen somehow.
>
> I have not tried putting the files on the hard drive. Ernie did, and it
> worked fine for him.
>
> Way to go Roger !! It works great. Thanks again..
>
> 73 Mike KD7TS
>
>
>
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