On Sun, Nov 20, 2011 at 06:45:50PM -0500, Peter Johansson wrote: > On Sun, Nov 20, 2011 at 5:52 PM, Byron Jeff = wrote: >=20 > > The only thing about JDM serial programmers is that it depends on a tru= e > > high voltage (i.e. +/- 12V) serial port for proper operation. Virtually= no USB > > serial interface supports those voltage levels. >=20 > My understanding is that the JDM programmer was only used in this case > to bootstrap the homebrew PicKit 2 programmer. Yes. But note that the author had to scrounge up a machine with a true blue serial port in order to do the job. >=20 > > That's the proper route if you actually need a programmer. As I believe= I > > outlined in my previous post, that if your final target is a bootloader > > (such as the picqueno32 in the link), then the idea of a simple code du= mper > > does still has some utility. >=20 > Do any PICs come with a serial bootstrap loader from the factory? Nope. > One > of the nice things about the MSP430s (which I am playing with these > days) is that many of them come with bootstrap loader in ROM from the > factory. Lots of non Microchip parts are like that, including the parallax propeller. The problem is that in order to pull it off you need a stable clock reference and a dedicated pin for the serial interface.. Fundamentally the PICs all come with a syncronous serial interface. It isn'= t really all that hard to connect to. BAJ >=20 > -p. > --=20 > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 Byron A. Jeff Department Chair: IT/CS/CNET College of Information and Mathematical Sciences Clayton State University http://cims.clayton.edu/bjeff --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .