April 19, 2011 AT 11:01 am
Reverse Engineering the RCA 1802
I’m always impressed with the folks at visual6502.org. This time, they’ve opened up an early CMOS chip, the RCA 1802 micro. It’s kind of like a proto-LSI time capsule. This chip was developed in the mid-1970’s and had radiation resistance, so it made its way into a number of spacecraft, including the Galileo probe.
From the visual6502 wiki:
Not only was the C2L CMOS process simpler, denser and faster than previous ones, it lends itself to radiation-hard chips, which led to this CPU being found in various space probes. (The bulk silicon process used for our RCA 1802 is not as radiation tolerant as the later silicon-on-sapphire processes, but it was better than other contemporary processes.)
As it happens, it’s also a great process for us to photograph and analyse, because the N and P structures show as different colours, and the layout is very readable.
Check out all the Circuit Playground Episodes! Our new kid’s show and subscribe!
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — Alibaba to invest $15b in tech, set up research labs around the world
Wearables — Special servo movement
Electronics — Trigger happy oscilloscope?
Biohacking — Biohacking: Visioneer – AI Glasses to Assist the Visually Impaired
No Comments
No comments yet.
Sorry, the comment form is closed at this time.