Lpc2000

Hello Leon,
I am using your circuit without problems. I had only one issue.

In your schematic is a HC244 buffer. The problem with this one, at least 
with the Philips type, it is not 5V tolerant. If it is powered by 3.3V 
then the inputs should not exceed 3.3V. It depends on the LPT port if 
this will happen. I think the LVC244 is a better choice just in case the 
LPT port delivers strong 5V levels. I have seen situations where the 
3.3V of the circuit was lifted by the voltage from the LPT port. 
(Because of the diodes between the input and the VCC in the HC device)

We are using the Rowley CrossWorks software.
(Nice software and very fast responding support people)

Best Regards,
Aalt

-- 
==============================
Aalt Lokhorst
Schut Geometrische Meettechniek bv
Duinkerkenstraat 21
9723 BN Groningen
P.O. Box 5225
9700 GE Groningen
The Netherlands
Tel: +31-50-5877877
Fax: +31-50-5877899
E-mail: Lokhorst@...
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Leon Heller wrote:

> You could try my JTAG interface design in jtag.zip. I know that works OK as
> I use it myself. The one you are using won't work with OCD Commander 
> without
> a slight mod. - pins 8 and 15 on the DB-25 connector need to be connected.
> The current OCD Commander software looks for that connection.
> 
> Leon
> --
> Leon Heller, G1HSM
> http://www.geocities.com/leon_heller