One is to use the ah/de-de/A conversion card

Abstract

This article introduces a kind of analog input and output function card (namely A/D-DA interface card commonly called) developed on the microcomputer. Insert it directly into the I/O expansion slot of the host, and then you can realize functions such as control, data acquisition, and signal processing on the machine. The interface card can be used in conjunction with IBM-PC, Apple-II microcomputer and TP801. This paper first introduces the hardware and software principle design and use of the interface card with IBM-PC as the main model, and then introduces the connection, expansion and use of other models.