This figure shows the Basic Computer model overlayed on the Computer System model where the additional functionality of the latter is greyed out. Hence a student begins constructing the latter by building the Basic Computer Model which consists of a simpler CPU, a small RAM, and dip-switches and LED’s as I/O devices. (Note: this model can be built by using the stand-alone Basic Computer Kit or by any of the other kits whereas the latter are equipped to further implement their respective greyed out functions but the former is not).

(Construction time: 16 to 19 hours).