Inside the 74181 ALU chip: die photos and reverse engineering
I took detailed die photos of the 74181 ALU that reveal how the chip works internally. It uses several different logic gates, primarily AND-OR-INVERT gates that have an efficient layout on …
计算机原理74181芯片,计算机组成原理 - CSDN博客
2021年7月15日 · 现在ALU电路已制成集成电路芯片，如74181是能完成四位二进制代码的算逻运算部件，其外特性如下图所示。 74181有两种工作方式：正逻辑和负逻辑。 下表列出其算术/ …
74181 - Wikipedia
The 74181 is a 7400 series medium-scale integration (MSI) TTL integrated circuit, containing the equivalent of 75 logic gates [3] and most commonly packaged as a 24-pin DIP. The 4-bit wide …
Yes, You Can Reverse Engineer This 74181 - Hackaday
2017年1月8日 · His latest is a reverse engineering of the 74181 Arithmetic Logic Unit (ALU). The great news is that the die image and complexity are both optimized for you to succeed at doing …
Inside the 74181 ALU chip: die photos and reverse engineering
2018年3月10日 · To find out, I opened up a 74181 ALU chip, took high-resolution die photos, and reverse-engineered the chip. 1 Inside I found several types of gates, implemented with …
Ken Shirriff's blog: January 2017
The 74181 was a popular chip in the 1970s used to perform calculations in the arithmetic-logic unit (ALU) of minicomputers. It is a moderately complex chip containing about 67 gates and …
Ken Shirriff's blog: March 2017
Die photo of the 74181 chip. I opened up a 74181, took die photos, and reverse engineered its TTL circuitry. My earlier article discusses the circuitry in detail, but I'll include a die photo here …
TI - SN74181J - CPU Graveyard - Dieshots
TI SN74181J General Specifications: Manufacturer: TI Type: ALU Family: 7400 Sub-Family: Part number: SN74181J Die marking: Core/Code/uArch: Cores: Die size: Transistors: Technology: …
World's first ALU chip - Rafal Bartoszak
The 74181 consists of 75 logic gates, making it a medium-scale integration circuit – MSI. It does not need a clock signal to work, because it is built as a combinational chip, in which two 4-bit …
74181 – Hackaday
2021年6月7日 · One of the more famous of these devices is the 74181, a cascadable 4-bit arithmetic logic unit, or ALU. An ALU is the heart of a microprocessor, performing its operations.