References

7400 series ICs

• Wikipedia List of most 74xx chips. If the datasheet link does not go to a PDF directly, the chances that the part is no longer available is quite high. Some may still be available on eBay.
• Logic Levels of the different families.
• Excellent 4-part Series on 7400 chips. Chapter 3 is particularly relevant.
• Excellent article on the 74181 ALU chip.

Textbooks

• John Wakerly. Digital Design Principles and Practice, 4th edition, 2006. Chapter 3 is an excellent and relevant introduction to digital circuits. There is an appendix with a review on electrical circuits basics.
• Horowitz and Hill. The Art of Electronics, 3rd Edition. Comprehensive text book and reference on electronics in general. Also has a chapter on digital logic and TTL chips (Chapter 10).
• Albert Malvino. Digital Computer Electronics, 3rd edition. The text book that Ben Eater used for his build.
• The All About Circuits text book on electronics.

Documentation of existing CPUs

• Intel 8080/8085
  • Assembly Language Programming Manual contains ISA description.
  • User Manual contains description of the interrupt mechanism.
  • ISA Overview in octal.
  • StackOverflow post on how interrupts work on the 8080. Note that the 8085 has a more sophisticated interrupt facility.
  • Ken Shirriff's posts on the 8085
    • ALU
    • Register file
• Zilog Z80
  • User Manual including ISA documentation.
  • Ken Shirriff's series of blog-posts's on the Z80 µArch.
• WDC 6502
  • Official Documentation including ISA description.
  • Peripheral Interface Adapter (6521) documentation. Contains information about interrupt handling.
  • Video on interrupt handling
  • In-depth post on interrupts.
• Motorola 6800
  • ISA

Other Builds

• Ben Eater's build and video playlist (based on the textbook by Malvino)
  • Intro
  • SR Latch ff.
  • Bus architecture and tristate
  • ALU design ff.
  • Control logic ff.
  • 555 timer ff.
• derulf1's build.
  • 64 KB RAM, interrupt controller, real-time clock, LCD display, SD card reader.
  • The video series is very detailed and goes in-depth on many aspects. Particularly helpful and interesting is the video on power distribution and the clock.
• rolf-electronics. Has extensive documentation that covers electronics problems.
• scamp-cpu. Comes with a browser-based simulator.
• YACC1 has a cool way of modularizing the components onto PCBs and connecting them with a bus.
• nqsap by Tom Nisbet features extensive documentation, many valuable tips, and helpful links to other resources.
• The fabulous Gigatron focuses on few chips and has a primitive ISA. It is programmed by a higher-level assembler whose programs run on interpreter. Has a cool ALU design. Features a small VGA graphics card.
• Homecomputer Webring with many more builds.

Video / Graphics

• Ben Eater's Videos on a VGA card
• VGA Timings
• VIC-II
  • Reference
  • Tutorial

Electronics

• Various guides on debouncing: 1, 2, 3 and an EEVBlog video.
• lordmonoxide's lessons learned from building an 8-bit CPU on breadboards.
• Good advice to draw schematics.
• PCB Design Tutorial.
• EEVblog has excellent tutorials on electronics, especially fundamentals videos on DC and AC. One particular video covers rise and fall times of TTL signals.
• Indispensable KiCAD Shortcuts.

Miscellaneous

• Verilog Library for 74xx Chips.
• customasm is a customizable assembler. Maybe useful for your own ISA.
• minipro can flash EEPROMs/Flash memory. We have SST39SF010 flash in the lab. You can write this with minipro -s -p SST39SF010 -w <filename>
• You can use Knoepfchen to get some buttons/switches/clock to your breadboard easily.