Peter Onion wrote :

> Hi,
> 
> I have a home-brew programmer that uses a 16F627 to program either
> 16F877s or 16F872s (or any similar devices)  There is a picture here
> http://www.btinternet.com/~Peter.Onion/PIC/DevSys1.jpg
> 
> I now want to improve it to handle 18F devices, (initialy 
> just 18F452s).

Why not just raplace the F627 with a F628, put some stuff
around it according to the sschematics on Wouters Wisp628
page and finaly simply load the Wisp628 firmware ?
(Yes, then you have actualy built a Wisp628, but anyway...)

I'm always interested in why people does what they does,
so why, as in this case, re-invent the wheel ? What does
your programming software do that (e.g.) the Wisp628
doesn't ?

> I've read the programming specification, and although I
> understand it, it is much more complex
> than the scheme used on the 16F series.  

Guess why there is a market for ready built programmers... :-)

Jan-Erik.



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