>SIS / Antti offers a universal software for these programmers which I wanted
>to use. The PIP-2 programmer has the GO function to let a 16C84 run in
>normal mode after programming. What is behind this 'undocumented feature'?

Hm.. that GO functions does that what you are looking for: in circuit run!

ie if the programmer hardware supports +5v or Logic H at MCLR pin then
the PIC will be reset and running, disconnecting (HiZ) RB7 and RB6

The only DIY programmer supporting this feature is AN589.

Note: AN589 does not HiZ correctly RB7 as that pin is connected
to LPT ACK, ie that pin has a pull-up.

cheers antti
----------------------------------------------------------
-- Antti Lukats                          Silicon Studio --
-- sis@rasi.lr.ttu.ee                    PO Box 3500    --
-- ftp://rasi.lr.ttu.ee/pub/sis          Tallinn EE0001 --
-- http://rasi.lr.ttu.ee/~sis            Estonia        --
----------------------------------------------------------