EDN

Building a 4-Bit Computer: The Instruction Set

The registers inside the CPU, the machine code instruction set, and the ways in which the instructions interact with the registers and status flags are all intertwined. As you may recall, one of my ...
VICE

32-Bit Integers and Why Old Computers Matter

They “found a surprise waiting for them on level 256,” writes Jamey Pittman at the Pac-Man Dossier. “It was a surprise no one knew about—not even the developers at Namco.” The 256th level is a ...
Law

Nervous System: 32-Bit Computers Dancing Backwards in High Heels

Fantastic technological leaps forward may be possible, but they leave behind a frustrated base of users invested in abandoned tech. One such example in the 1970s was the rise of 32-bit memory ...
EDN

Building a 4-Bit Computer: Instruction Trade-offs

If you are limiting yourself to only 16 instructions, which ones should you chose, and how do you manage without the ones that fall by the wayside? In my previous column on our project to build a ...
GlobalSpec

Appendix B: ACPI Registers, Bits, and Control Methods

This appendix defines the specific ACPI registers, bits, and control methods mentioned in the text. See the ACPI 2.0 Specification for definitions of the entire set of ACPI registers, bits, and ...