--- Denny Esterline <firmware@tds.net> wrote:

> > Hope I have this categorized right:)  If not, do
> let me know.  I have
> > the Olimex PG4 board, with a PIC16F84A.  I'm aware
> that the olimex
> > board uses the serial port for power, and it will
> not work with a USB
> > to serial adapter.  Unfortunately, I don't have a
> serial port on this
> > computer.  Is it possible to power the olimex
> board off of a 9v
> > adapter while programming?  Or can that only be
> used while the chip is
> > running?
> > 
> > -- 
> > Paul Anderson
> > VE3HOP
> 
> Voltage levels are only a small part of the problem
> here. The built in programer is a variation of the
> JDM type, they work by abusing the RS232 spec to
> create the voltage levels and timings neccesary for
> programing. A USB-serial adaptor _cannot_ be made to
> work with this programmer, there is no way to
> directly manipulate the control lines in the needed
> fashion. The only way to do this is to use a PC with
> a real serial port (which might still have issues)
> or to use an external programmer. 
> 
> -Denny
> 
 I believe that the current supplied by the RS232 is
not defined. So there is no guarantee enough power is
supplied.

John


 
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