> So my question is: why did you not simply use the parallel port of the PC
> to program the PIC18F2455 directly? That was the entire purpose of my
> Trivial LVP PIC programmer:

Mostly for historic reasons. i started my affair with microcontrollers by u=
sing 8051s. programming was through parallel port using parallel interface.
Got to know about SPI programmable 8051s some time later. By this time i ha=
d designed my own serial port-to-SPI programmer as i found parallel port to=
 be bit flaky and cumbersome to use(may be my chip-on-breadboard technology=
?).
I started tinkering with PICs much later after i stopped using the parallel=
 port.

-Mahesh

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