Middle aged male computer programmer, micro-controllers and retro computing enthusiast and hobbyist.

Tampa, Florida
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This user joined on 11/18/2016.

Things I've Built

Parallax Propeller based character terminal with retro keyboard.

This terminal is nothing original, but I found a use for my TI99/4A retro keyboard controller and with Propeller chip being so easy as an I/O controller, I am building a simple character terminal app. to control my MKHBC-8-Rx homebrew computer.

Arduino based aquarium feeder and light on/off scheduler.

Built with Arduino Nano, I2C LCD and 2 buttons, step motor, re-purposed battery operated fish tank feeder from Walmart and a relay for light on/off function. It is used on a real fish tank at my home for more than a year now.

Retro keyboard controller for micro-controller projects.

This is TI99/4A matrix keyboard with AT89S52 micro as a controller, serial interface similar to PS/2 (but simpler protocol) with Data and Clock lines. Easy to connect to Parallax Propeller or other micros.


This is still in progress. A MOS 6502 based 8-bit generic purpose microcomputer. Currently controlled with serial terminal, but being an expandable architecture I am adding peripherals as I go. Currently: RS-232, Banked RAM, RTC, MOS 6502 @2 MHz

LED Matrix Text Scrolling Message controller.

LED Matrix Text Messaging/Prompter controller. Based on AT89S52 (8051 compatible) built with chained LED matrix displays with individual controllers/shift registers, RS-232 as controlling interface and internal scripting engine and storage.

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Igor wrote 09/05/2021 at 15:20 point

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Mitsuru Yamada wrote 09/05/2021 at 03:22 point

Thank you for liking my #Homemade Floating Point Interpreter for 6502. In order to comprehensively check the operation of the interpreter, I was able to run the Fourier transform program as some scale of operation, and I just added it to the article yesterday.

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mel wrote 11/25/2019 at 08:53 point

Marek, Just seen the arduino fish feeder etc. I too keep fish and shrimps, intended to build something like this for ages, just never got around to it.

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mel wrote 11/25/2019 at 08:50 point

Hi Marek,

                     Thanks for liking and following the Interak Z80 computer system.


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