Tomi Virtanen wrote:
> I tried the following:
> 1.      load data all '1's      (000010b, 0b, 11111111111111b, 0b)
> 2.      bulk erase pgm mem      (001001b)
> 3.      begin programming       (001000b)
> 4.      I waited 10ms before doing anything else to it..
>
> But no bulk erase happens...

Close.  It seems the bulk erase commands work like the load data
commands and need data.  Here's what I do:

1. send 001001                 bulk erase program memory
2. send 0111111111111110       all 1s data (padded with 0s)
3. send 001000                 begin programming
4. delay 10ms

With a similar sequence for bulk erase data memory.

By the way, the C source code of my own programmer software is
contained in:

http://www.man.ac.uk/~mbhstdj/files/pic84v04.zip

David