Hi,
I'm very new at this but I'm excited to make my first contribution.

I've recently had a similar problem with a 16C84. The Code Protection
bit was inadvertantly set by an errant power supply. It spiked to about
12VDC when I powered it up. All worked fine until I erased and
reprogrammed ( or at least tried to ).

Erik

Jim Robertson wrote:
>
> At 23:43 22/01/99 -0000, you wrote:
> >Hi, Piclister's
> >
> >I have a new problem for me, perhaps not for some more experts:
> >
> >When verifying the device it is blank, I receive the message:
> >
> >Device is NOT blank
> >Program Memory
> >Configuration Bits
>
> >If we make reading of the device, we obtain:
>
> >Code Protect = ILLEGAL !!!!!!!!!!!!!
> >
> >and 0x00 (data) from 0x000 to 0x0FFF (address) in memory program
> It sounds that some, but not all, of the code protection bits have been
> programmed.  This accounts for the illegal code protect option message
> and why you can only read all 0's.
>
> The device is ruined (if it is been read correctly.)
>
> >Does know some way of avoiding such a problem in the future?
>
> It sounds like you may be using one of my programmers or maybe one of
> the "copies" as the syntax you use is identical to mine.
>
> If this is the case for the warp-3 ensure you have the TM4 driver and
> firmware. This will disallow the code protection BUT you must select
> the right device. If you select 16C74 it will NOT shut out the code
> protection.
>
> The PP1 can shut out the code protection if you use /L- on the command
> line. That is "slash, L, minus"
>
> Earlier Version 3 software and firmware also shuts out the code protection
> but there is a back down way to fool it, that is why you should have
> the TM4 stuff instead.
>
> Other programmers can shut out the protection. Consult with the
> manufacturer.
>
> Jim
>
> >I thank any answer.
> >Thank you
> >
> >Joao
> >jq96@claret.com.br
> >jq96@netsite.com.br
> >
> --------------------------------------------------------
> Jim Robertson
> Email: newfound@pipeline.com.au
>
> http://www.pipeline.com.au/users/newfound
> --------------------------------------------------------