Archive for the ‘reversed’ Category

Reverse-engineering the surprisingly advanced ALU of the 8008 microprocessor

Friday, February 10th, 2017

Ken Shirriff has written an article on reverse engineering the ALU of the 8008 microprocessor: A computer's arithmetic-logic unit (ALU) is the heart of the processor, performing arithmetic and logic operations on data. If you've studied digital logic, you've probably learned how to combine simple binary adder circuits to build...

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Inside the 74181 ALU chip: die photos and reverse engineering

Wednesday, January 11th, 2017

A detailed die photos and reverse engineering of the 74181 ALU chip by Ken Shirriff: What's inside a TTL chip? 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 interesting circuitry and unusual...

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Die photos and analysis of the revolutionary 8008 microprocessor, 45 years old

Friday, December 30th, 2016

Ken Shirriff has written an article detailing die photos of the vintage Intel 8008 that reveal the circuitry it used: Intel's groundbreaking 8008 microprocessor was first produced 45 years ago.1 This chip, Intel's first 8-bit microprocessor, is the ancestor of the x86 processor family that you may be using right...

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Inside a RFID race timing chip: die photos of the Monza R6

Tuesday, November 1st, 2016

Ken Shirriff took some die photos of the Monza R6 chip  and wrote a post on his blog on how the RFID timing chip works: I recently watched a cross-country running race that used a digital timing system, so I investigated how the RFID timing chip works. Each runner wears...

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Reverse engineering a server CPU voltage regulator module

Monday, September 26th, 2016

Andy Brown wrote an article on reverse engineering a CPU voltage regulator: A recent ebay fishing expedition yielded an interesting little part for the very reasonable sum of about five pounds. It’s a voltage regulator module from a Dell PowerEdge 6650 Xeon server. I originally bought this because I had...

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Reverse engineering a simple four function calculator: die decap

Friday, August 26th, 2016

Electronupdate did a teardown and analysis of a cheap four function calculator: It's such an amazingly old looking die Even with 400x magnification it would not be too hard to reverse engineer back to a schematic! This must be a very old design indeed. When one thinks of high-tech it's...

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Reverse engineering the popular 555 timer chip (CMOS version)

Tuesday, April 12th, 2016

Ken Shirriff wrote an article on reverse engineering a 555 timer chip,  He writes: This article explains how the LMC555 timer chip works, from the tiny transistors and resistors on the silicon chip, to the functional units such as comparators and current mirrors that make it work. The popular 555 timer integrated...

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Nevo C2 remote control – Reverse engineering, part 1

Tuesday, March 8th, 2016

Reverse engineering of a Nevo C2 remote control from Most recently I've switched to the "Nevo C2" remotes (also known as "Xsight Color" or "ARRX15G"), which have a graphical display built in. This makes it easy for me to deal with the huge array (TiVo, HTPC, plus eleven game consoles)...

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555 timer teardown: Inside the world’s most popular IC

Monday, February 22nd, 2016

Another great teardown article by Ken Shirriff, a look inside the 555 timer chip: Given the popularity of the 555 timer, I thought it would be interesting to find out what's inside the 555 timer and how it works. While the 555 timer is usually sold as a black plastic...

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Inside the arm1v – the ALU control logic

Tuesday, February 16th, 2016

Dave writes: This is one of a number of posts on my work on reverse engineering the armv1 processor. The first in the series, and an index of the other articles can be found here. My first post in this series described in some detail a one-bit slice of the...

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More ARM1 processor reverse engineering: the priority encoder

Saturday, January 16th, 2016

In a previous post, Ken Shirriff reverse engineered the silicon in the ARM1 processor, this time he reverse-engineer the priority encoder in the ARM1 processor: In this article, I reverse-engineer the priority encoder in the ARM1 processor. By examining the chip layout provided by the Visual ARM1 project, I have...

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Counting bits in hardware: Reverse engineering the silicon in the ARM1 processor

Wednesday, January 13th, 2016

Ken Shirriff writes: How can you count bits in hardware? In this article, I reverse-engineer the circuit used by the ARM1 processor to count the number of set bits in a 16-bit field, showing how individual transistors form multiplexers, which are combined into adders, and finally form the bit counter....

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Reverse engineering the ARM1, ancestor of the iPhone’s processor

Monday, January 4th, 2016

Another great article from Ken Shirriff, this time on reverse engineering the ARM1: Almost every smartphone uses a processor based on the ARM1 chip created in 1985. The Visual ARM1 simulator shows what happens inside the ARM1 chip as it runs; the result (below) is fascinating but mysterious.[1] In this...

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Reverse engineering the ESP8266 WIFI-to-Serial port adapter

Friday, January 1st, 2016

Here's a video from electronupdate on reverse engineering the ESP8266 WIFI-to-Serial port adapter: Another very interesting bit of technology. The combination of so much functionality into such a small part is a real touch-stone as to where things are heading. A quick look at the antenna design to see if...

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Looking inside a silicon die

Wednesday, December 16th, 2015

electronupdate writes: A very interesting branch of electrical engineering is the reverse engineering and analysis of silicon dies of semiconductors. The tools to play in this field are very specialized and I suspect very expensive. In this video I went for the spend-no-money approach to see how far I could...

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Understanding silicon circuits: inside the ubiquitous 741 op amp

Friday, October 30th, 2015

Ken Shirriff's writes, "The 741 op amp is one of the most famous and popular ICs with hundreds of millions sold since its invention in 1968 by famous IC designer Dave Fullagar. In this article, I look at the silicon die for the 741, discuss how it works, and explain...

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Schlumberger 4002 signal generator

Friday, September 25th, 2015

Mario wrote an article on reverse engineering a Schlumberger 4002 signal generator: What I got was a Schlumberger 4002 signal generator. It ranges from 0.1 to 2160 MHz with 10-20 Hz tuning accuracy, selectable output amplitude from -138.9 dBm up to +13 dBm in 0.1 dB steps, auto-sweeping and several extras like an...

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Examining the core memory module inside a vintage IBM 1401 mainframe

Tuesday, September 1st, 2015

Ken Shirriff writes: The IBM 1401 mainframe computer was announced in 1959 and by the mid-1960s had become the best-selling computer, extremely popular with medium and large businesses because of its low cost. A key component of the 1401's success was its 4,000 character core memory, which stored data on...

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Sniffing Crazyflie’s radio with HackRF blue

Friday, June 12th, 2015

arnaud acquired a HackRF Blue and has been busy coding up a GNURadio project for analyzing Crazyflie radio transmissions. Crazyflie is a nano quadcopter/drone controlled over a wireless link. The Crazyradio is the official radio dongle for the Crazyflie Nano Quadcopter. It is a 2.4GHz USB radio dongle based on...

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Reverse engineering a Beseler PM2L Color Analyzer

Tuesday, January 6th, 2015

Kerry Wong wrote an article on reverse engineering a Beseler PM2L Color Analyzer: I recently acquired an old Beseler PM2L color analyzer. This kind of color analyzer was designed to analyze the color or exposure of film negatives at a certain location by comparing the intensity of the filtered light of each...

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