Using the Basic Stamp Microcontroller
The Basic Stamp microcontroller allows you to write a program in a simple language on a PC and quickly download it and run it in target hardware.
The hardware configuration provided at NU (inset below) is decribed on a web page Basic Stamp Hardware
Software for editing a program, and for running it on the target Stamp, is on the Parallax download page
The user manual is available there too, but here is a local copy to which I have added comments
Below is a screenshot of the editor window, showing a program I wrote for the BS2px24 that counts in binary on 4 LEDs.