FreeBSD Architecture Handbook
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# Chapter 10 ISA Device Drivers

Written by Sergey Babkin. Modifications for Handbook made by Murray Stokely, Valentino Vaschetto, and Wylie Stilwell.

# 10.1 Synopsis

This chapter introduces the issues relevant to writing a driver for an ISA device. The pseudo-code presented here is rather detailed and reminiscent of the real code but is still only pseudo-code. It avoids the details irrelevant to the subject of the discussion. The real-life examples can be found in the source code of real drivers. In particular the drivers `ep` and `aha` are good sources of information.

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