>
> Hello!
>
> I wonder if anybody knew where (on the net) I can find drawings on a PIC
> programmer that can program PIC16C74 and stuff like that... I have seen
> houndreds of 16F84 programmers but where are the programmers that can
> program other PIC MCU:s

It's due to the same catch-22 we've been discussing in other threads. The
reason that 16F84 programmers are popular, easy, and cheap are because the
core memory is EEPROM based, which is programmed in a self timed fashion.

All the other PICs are EPROM based with an algorithm that requires 100
microsecond (uS) programming pulses. The problem is that most PCs can't
easily be pinned down to delays that short.

The best way to do this IMHO is to use a PIC to program other PICs. A 16F84
can trivially handle the timing and interface chores for programming any
serial interface programmed PICs, which includes all the 14-bit core series
and the 12CXXX series.

But except for the PicPro programmer design no one has taken this approach.
And the PicPro does too much, simulator, programmer, target too.

It's something on my list of things to do, but I don't know when I'll get
around to it.

BAJ
>
>
> /Andreas Magnusson
>