Hi,
I wanted to try a PIC outside of its ICD circuit (connected to the Inchworm) after programming it. I programmed it with the Flash a LED code from William for the 16F628A.

The program works perfectly in the ICD circuit. If I remove the PIC and put it in another circuit, powering it from a regulated 5V supply, it doesn't work. I have a constant ~2V on RB0 where I should normally see it switch from 5V to 0V every ~1.2 seconds according to the code.

Do I have to connect more than just Vss and Vdd to have a functional PIC?
If so, where could I find this information by myself? The Microchip datasheet for the 16F628A is not very helpful for getting started, it is too dense with advanced technical information.

One more thing: When I try to use the Inchworm as a programmer only, there is no problem. If I try to use it as a debugger, though, I get this error when connecting from MPLAB to the Inchworm: " Invalid target device id (expected=0x89, read=0x83)". I use a 16F628A and when I go to Configure -> Select device, there's a green circle beside MPLAB ICD2 Debugger, so it should be supported.
Do the connections to the target PIC have to be different for debugging from just programming?

That works, thanks.

I deleted my post as you replied because I realized what was going on (it wasn't running in the ICD circuit).