Interfaccia per misure on-line nel laboratorio di fisica con computer Apple

We describe hardware and software of a low-cost interface board designed to allow easy measurement of analog quantities and time intervals by Apple IIe computer in the physics laboratory. The device includes a timer, a four channel A/D converter and the corresponding conditioning circuits for data acquisition. To the purpose of promoting the use of the computer on-line in the physics lab., we chose a computer of simple architecture and a didactical approach which allows even those who do not use the Apple IIe to understand the basic principles on on-line data acquisition.