>  Dave Van Horn wrote:

> They make stickers specifically for this. You need to block UV (erases the 
> chip) and visible as well as IR light, which can cause photoelectric 
> effects on the die.

Who makes the stickers. Since I still have some erasable devices I'll want 
to get some that really work.

> Still, it dosen't seem that your problem originates here.
>
> All input pins pulled up or down as appropriate?

Yes

> All unused pins set to output, or input with pullups?

Yes

> All interrupt vectors handled, and no unneeded ints turned on?

Yes

> Scoped VCC and Reset?

Reset gives a nice clean reset pulse. Even though there are supposed to be 
internal pull-ups I added a 4.7 Kohm pull-up per list suggestion.

I also scoped the Vcc and there is a very small amount of HF garbage (I 
suppose) superimposed on the 5 volts.

Ed
_______________________________________________
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist 

_______________________________________________
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist