A nice site that might serve as a refresher for digital logic is http://www.play-hookey.com/digital/
. There is a very nice schematic based logic simulator, Logisim
, that can be quite helpful.
Read the Project 0 materials on the Course Page
. Don't miss the lecture slides; hit the Acrobat icon in the Lecture column. Note that it is important to do the Project 0 work in the projects/00 directory, not the projects/01 directory.
Read The Hardware Construction Survival Kit
The projects in the book are well sequenced to lead you along. It is important to do the chips in the order presented in the book since they build upon each other in that sequence. For Project 1 follow the order starting with 1.2.2. Some people try to do the Xor when they are reading the chapter text, but it wont work without having implemented earlier required chips.
Ask questions on the forum. If you have questions that you don't think are of general interest to the forum, feel free to email me directly.