Hi,
Ive been having the same problem.
Im using this USB cable converter with chip Prolific PX2303 i think, and the cable says on it: u232 p9
http://www.serialgear.com/1-Port-Serial-USB-U232-P9.html
With Velleman progpic2 v 2.6.0, I could program the pic with simple code only (demo1.asm), sometimes getting errors, to program pic with a bigger one, Im having tough times (demo2.asm), no success.
-When I used latest version of Vellemans progpic, it doesnt work at all
I also tried another pic programming software like WinPic, Icprog, and PicProg2009
AND
had luck with PicProg2009!
you can get it here:
http://www.vellemanusa.com/support/downloads
or here:
http://www.velleman.eu/support/downloads
I have no idea why, its not supposed to work, as advised by Velleman, but it does, maybe because it verifies while programming and when verification is not correct, it repeats until it is correct? no idea…
Now i could program the k8048(pic16f627) with bulkier code, like demo2.asm. I tried this several times and still works…
In picprog2009 you have to configure hardware delay to 10, otherwise it doesnt have to work (says the settings does not match the pic…). My settings on emulated port are defaults, looks like it works with any…
*I noticed the progpic2 2.6.0 behaves differently on my laptop x desktop - doesnt work at all / does. Will see later if all of this is going to work on my laptop
good luck
J.