Lpc2000

I'm laying out a board to test the LPC2138 and looked at circuit 
diagrams for various 2106 and 2138 boards, to get the JTAG right.

Some of the diagrams (see Leon's in the file section) use a 74x244 to 
buffer the JTAG signals and optionally a transistor on the reset 
line. The Keil 2138 board only uses a few pull-up/pull-down 
resistors, no buffer/transistor (there are a few minor differences 
between 2106/2138 on activating JTAG).

On the IAR 2106 board I figured they did it just to isolate signals 
between the primary/secondary JTAG ports. 

I don't see any compelling reason to use the buffer unless you prefer 
to zap the buffer with static rather than the LPC. Or maybe if you 
have a questionable JTAG-parallel/usb converter.

Anybody (Leon?) have any insight?

thanks, Tom