Re: WP34s Parts List Message #4 Posted by Marcus von Cube, Germany on 2 Feb 2012, 6:43 p.m., in response to message #3 by Barry Reeves
JTAG is useful if you want to join the team for hardware development. My original unit which has the JTAG connector broke (failure of the serial connection) and I have yet to add the connector to my present development unit. So far I could live without, thanks to the emulator as a debugging platform.
The serial port modification will most probably be not very useful as well. It's better to butcher one of the programming cables and add an FTDI 3V USB/serial converter to the RS232 end of things. I just removed all the guts from the small board, except the switches, and wired the FTDI cable ends directly to the other end of the board.
The crystal modification is very useful. You can then install a special image (calc_xtal.bin) which starts the quartz oscillator on startup and lacks the internal logic to support the RC oscillator. I've added the stopwatch instead (which makes the image larger than the default image, of course.)
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