> I don't understand what I/O delays on the Windows side should
> have to do
> with anything.  What is the connection between the PC and
> this programmer?
> Is it using a COM port?  Whatever is receiving the commands
> from the COM
> port must deal with the real time issues.  These are too fast
> for a PC and
> serial communication.

These are directly connected serial port proggers. Data and non-data
lines are used as 'binary' IO to program the chip. This used to be easy
with direct access to the UART chip, but with windows inbetween I guess
delays are needed for instance to make sure that a handshake line realy
goes low->high->low. I don't agree that the PIC programming interafce is
to fast for a PC: it can be operated as slowly as needed. But it is a
bit cumbersome, I agree that in the days of XP etc. a 'serial'
programmer has local intelligence and communicates with a PC in a 'sane'
way (asynch serial, USB, or maybe even parallel).

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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