MChip should provide a code-protect-protect-bit... so that one can protect himself agains accidentally programming the code-protectbit Regards, Jilles Oldenbeuving jilles@rendo.dekooi.nl ------- I have been experimenting with a 16C73B for a couple of weeks with no problems and in the last few days I have ruined 2 of them by accidentally code protecting them. The first time I thought it had been my mistake, bu= t then I has more carefull and the second one only lasted a couple of hours= , and I am completely sure about checking the code protection bits before eache individual programming. So I think this might have something to do with teh programmer (Ider HW o= r SW) or somehing about my PC. I am using Bojan=B4s Picall programmer with home made HW on a generic pen= tium 233 PC. Any ideas on what can be hapening? or what condition should I avoid to reduce teh risk of this happening again? This is not funy sience this chips cost $40 each here. Regards, Esteban.