This paper presents a real-time and multi-task processing system developed on IBM PC-DOS (or MS-DOS) which is a single user and single-task operating system.

本文介绍了在IBM PC的单用户单任务磁盘操作系统IBM PC—DOS或MS-DOS基础上实现的一种适用于各种监控系统的实时多任务系统。

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Probably, but Semmelhack points out that the second slot (covered behind a flap) is dedicated to loading the operating system, making it a trivial task to quickly switch between kernels or get unbricked.

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