How to Write Kernel Drivers with NEWBUS
Covering how to actually write a newbus driver with a complete description of the framework of a led-newbus driver.

Writing a CAM SCSI controller (A.K.A. Host Bus Adapter) driver
An in-depth tutorial on SCSI driver creation.

Writing a pseudo device
The document covers the writing of a simple pseudo-device driver and is meant to provide a guide to someone who wants to start writing kernel drivers.

Writing an ISA device driver
Covers writing a driver for an ISA device with descriptions of general bus-related issues and psudo-code examples. Explains kernel config file order, auto-configuration and probing, resources, DMA and interrupts.