>>Has anyone on the list built the LUDIPIPO PIC Programmer
>>for the 16C84? Does it work?

I've built the Jens Madsen modified Ludi RS232 programmer (11 parts )and it
works fine on my old 586/133 with the Pixxer software under dos but not so
happy under Windoze95.

>>
>>It seems to be a very simple design and looks ideal for
>>a first attempt at building a programmer.

Excellent for a match box sized unit, for programming only (without the
hassels of needing a psu), but for prototype development, may I suggest any
variation of the David Tate parallel port unit, as its easier to analyse
and easier to program in cct. See comment below.

>>
> Hello,
> yes, i'd built it in 1 hour and it works fine! You can use windows or dos
>software, both of them very friendly. However, I think that it doesn't
>support in circuit programming, that is, connecting the pic circuito to the
>programmer pcb by a cable. That's what I'm trying to do now with other
>programmers.

I also couldn't connect up my RS232 unit to program in-circuit due to the
voltage offsets, I'm not saying it can't be done, just that I preffered to
use the David Tate parallel port circuit. This is now working just the way
I want it to. I use a 14053 analog mux on RB6 and RB7 (the programming
pins) so all 16C84 I/O pins are available for use in any development
circuit.I download the program (assembled C source) to the circuit under
development while the 16C84 is running. Everything stops for a couple of
seconds and then the new program takes over, no switches to set or chips to
swap, it all happens from the pc keyboard.
                                Regards Terry