gnupic: Re: [gnupic] more on first picprog attempt
Subject:
Re: [gnupic] more on first picprog attempt
From:
Robert Pearce ####@####.####
Date:
18 Jun 2006 21:55:49 +0100
Message-Id: <ohjPS9AMhXlEFwUp@jonah.huneausware.local>
On Sun, 18 Jun 2006, Jan Wagemakers ####@####.#### wrote :
>Eamon Skelton ####@####.#### schreef:
>
>> JDM programmers connect VDD to the serial port ground and put a
>> negative voltage on VSS. I think the Olimex programmer is based
>> on the JDM?
>
>The schematic is available here
><http://www.olimex.com/dev/images/pic-pg2c-sch.gif>.
>
Gah! Yuck!
Quite apart from the poor schematic layout, I'm actually struggling to
see how on earth C1 ever gets charged up. It sure won't work on a low
voltage serial port, and I'd be dubious about it on a MAX232 type one.
And even on a very old style serial port it's limited to flash devices.
Now I remember why I rolled my own.
--
Rob Pearce http://www.bdt-home.demon.co.uk
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