Visualize incoming/outcoming signal from computer?

[jackdavis]

I just wonder,

Is there any software or hardware can view each action on specific pin of microcontroller from computer. For example, I programmed PIC16F84A (such as High B0, pause 1000, low B0) then install it in a circuit. So, 10101010 show on computer for each action from this pin.

Sorry, English is my second language.

[HenrikOlsson]

Hi,
What you are looking for is a logic analyzer. There's a few low-cost ones available that you connect to your PC. LOGIC is a fairly new one that seems extremely easy to use and is quite cheap but there are others.