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About the 1802 Olduino

The Olduino is a retro-Arduino.  It uses an RCA 1802 processor from the 1970s but adds hardware and software so it can function  like an arduino and use some arduino add-on shields.  The Olduino is more limited than an Arduino but that is part of the fun.  The Olduino has 9 dedicated output pins and 4 inputs.  It lacks(so far) analog input and output capability but can still use many basic shields.  The Olduino has hardware support for high speed SPI(Serial Peripheral  Interface) through a set of shift registers on the olduino board.  It can do high-speed serial communications to an attached PC through an onboard AVR slave processor. 14-09-16 olduinobuild1

Some of the Olduino projects and capabilities are shown below:
14-08-26 rangefindercard

14-08-31 tms1638 card

14-09-07 ethernet card

14-08-28 compatability

14-08-26 codeandgocard

The Olduino is based on Lee Hart’s Membership Card 1802 computer     and my LCC1802 C compiler:

There’s a lively interest group for the 1802 at and

14-08-27 billtoo

My name is Bill Rowe. I built my first home computer in the 1970’s from the Popular Electronics article. I got out of hardware hacking in the 1980’s but came back when somebody gave me an Arduino in 2008. When Lee Hart made the little Membership Card I thought “Hmmm Olduino?” The Olduino has been through several generations of hardware and software and boasts its own C compiler. I have enough development plans to keep the project going for a while.  You can reach me through the form below or directly as bill_rowe_ottawa at

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