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'Programmer problems, PP, ( and AY3-8912A)'
1999\08\09@163328 by Karl A. Uscroft

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----  Help,

I just can't get any programmer that I build to work.  I've built a com port
programmer but I didn't have the voltage out of my computer and now I've
built David Taits Parallel programmer, and again it doesn't work.  So my
question is has anyone had problem's with their home made programmers and had
problems that they have found answers to, because I just can't get mine to do
anything.

Second thing,  does anyone know were I can get datasheets for the AY3-8912A
sound chip.  Can't find a thing on the net.

Cheers,  Karl

:-)

1999\08\10@150128 by Mark Willis

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face
I haven't done one of those, Karl, but can suggest one possibility on
the com port programmer - Use a power lump & 7805 (or other regulator)
to power your programmer, if you cannot get enough power out of the
serial or parallel port.  Put a series diode (1N4001 style) after the
regulator, and another in the ground lead of the regulator, and you can
make it such that, with the power lump plugged in, you have 5V on the
power bus (and the diodes off the parallel or serial port aren't
conducting at all), and without the lump it'll still run on some
computers.

If you point me at your com port schematic I'll give you more specifics,
if you want.

 Mark

Karl A. Uscroft wrote:
{Quote hidden}

1999\08\23@172215 by wzab

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On Mon, Aug 09, 1999 at 04:32:31PM -0400, Karl A. Uscroft wrote:
> ----  Help,
>
> I just can't get any programmer that I build to work.  I've built a com port
> programmer but I didn't have the voltage out of my computer and now I've
> built David Taits Parallel programmer, and again it doesn't work.  So my
> question is has anyone had problem's with their home made programmers and had
> problems that they have found answers to, because I just can't get mine to do
> anything.

Yes, I had some problems with my own PIC programmer
(http://www.ise.pw.edu.pl/~wzab/picprog/picprog.html).
The problems were caused by too long flat ribbon cable between programmer and
printer port.
I've added a simple RC-filters (see my web site) and introduced small delays
into the programming software. Now everything works fine!
--
                       Wojciech Zabolotny
                       spam_OUTwzabTakeThisOuTspamise.pw.edu.pl

http://www.debian.org  Linux - free OS for free people!

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