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The UART is fully enabled and works fine.  The Break Detect option in Code Architect adds the same line I have shown above.

I grounded RxD for several minutes and nothing changed.

Could anything have changed since v2.49, when you tried it?
http://www.esacademy.com/software/flashmagic/forum/read.php?f=1&i=2767&t=2751

I'm using the Keil MCB900 eval board with a P89LPC938 at 7.3728MHz.  For ISP, I would like to use the break detect method instead of the hardware method, but I can't seem to get it to work.  

On the MCB900, I have a jumper on RUN and no jumper on RESET.  In the code initializations, I enabled EBRR, the UART Break Detect Reset Enable:

AUXR1 |= 0x40;    // enable EBRR (break detect into ISP)

In FlashMagic v3.25.124, I have High-Speed Communications on up to 9600 and DTR & RTS turned off.  I run ISP|Start Bootloader... and then send a Break condition.  Then I run Read Device Signature, but it times out with an error.  I've tried it at 7200 and 9600.  I have the main code flashing an LED, so I know it's running.  The LED continues to blink during and after the break condition.

I've gone through the NoTouch/Touchless documents.  I may use this method eventually, but I'd like to get break detect working first.