AVR-Chat

----Original Message----
From: AVR-Chat@yahoogroups.com
[mailto:AVR-Chat@yahoogroups.com] On Behalf Of
andrew.mathison Sent: 07 October 2009 10:40 To:
AVR-Chat@yahoogroups.com Subject: [AVR-Chat] Re: ISP Port
Restictions 

> May I try and warn you that the resistors you are
> contemplating using, could allow more current than many
> PPorts can supply....  
> Please check on the web yourself, but generally speaking,
> you cannot rely on sourcing more than 2.5ma or sinking
> more than 24ma. In fact some cannot even sink that much.  
> 
> A place to start is here:-
> http://www.lvr.com/files/ibmlpt.txt
> 
> If you are just using a plug in LPT: card in a PC,
> blowing it is of almost no concern (I would NOT use the
> mainboard printer port for anything other than a printer
> as its part of the mainboard chip set nowadays!!) as a
> cheap replacement will get you up and running again.    
> 

Yes, really I would recommend buying the Atmel AVR-ISP which is a USB
device costing about $30 / 25 euro (depends where you are in the world).

Saves a lot of messing around and the danger of blowing up your PC.

-- 
Tim Mitchell