An operating system shell, named GPDAS (General Purpose Data Acquisition Shell), on MS-DOS-based microcomputers has been developed to provide flexibility in data acquisition and device control for magnet measurements at the Advanced Photon Source. GPDAS is both a command interpreter and an integrated script-based programming environment. It also incorporates the MS-DOS shell to make use of the existing utility programs for file manipulation and data analysis. Features include: alias definition, virtual memory, windows, graphics, data and procedure backup, background operation, script programming language, and script level debugging. Data acquisition system devices can be controlled through the IEEE488 board, a multifunction input/output (I/O) board, a digital I/O board and a Gespac crate via a Euro G-64 bus. GPDAS is now being used for diagnostics R&D and accelerator physics studies as well as for magnet measurements. The hardware configurations are discussed.
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