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I have some experience with C/C++ and have authored a couple CLI and GUI programs, mostly in Perl, but I've lately been wanting to move onto something different. I've tried to no avail to find an entry point to low level, kernel/systems programming. Do you know a good place to start?
One of the most-hacked pieces of hardware is the PC parallel port. It is easy to understand, and easy to interface electrically. Start with writing a character device driver that makes it read some switches and turn on some LEDs. If you can get an old motherboard that has one on-board, or an ISA-bus motherboard, you will avoid the complications of dealing with PCI.
the book Linux Device Drivers is a good place to start to play with low level programing.
it is available online: http://lwn.net/Kernel/LDD3/
the chapter 9 have an example using the parallel port.
the book also have examples with PCI driver, USB, network, block drivers, interrupt handling, etc.
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