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Hi Jan,

See Erik's post here suggesting he posts the query here.

http://www.8052.com/forum/thread.phtml?thread=147797

It may be FM related, as he's setting the lock bits via FM.

Thanks for looking Joe. I'll check it again...

I table my findings and proposed ISP-ICP bridge circuit (improvement)  attached.

Hi Joe,

I've built and used your proposed circuit with success, but with one observation. Without the amended circuit connected, LED P2.3 lights to indicate ICP entry. With the cable connected it doesn't light at all. Has anyone else found this, or have I messed up building my cable?

Thanks,

Rob.