Archive for the ‘Electronics’ Category

TMS9918A Emulator for Parallax Propeller-2

Written April 21st, 2021 by

A few weeks ago I purchased a P2 Edge card equipped with the new Parallax Propeller-2 microcontroller. To practice and familiarize myself with the new features, I ported the emulator for the TMS9918A chip from Texas Instruments that I made for the Propeller-1.

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Hayes modem with Arduino and ENC28J60 ethernet module

Written March 24th, 2021 by

I had this ENC28J60 ethernet module in my drawer, purchased months ago and practically never used, so I thought I could use it to make an Hayes-compatible modem on a wired ethernet network. It could be a valid alternative to WiFi modems for environments where the signal does not arrive very well. It also helps to recreate the cable crowding typical of the past years.

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Yet Another TZX/CASDuino Variant

Written January 18th, 2020 by

There are several implementations of the famous TZXDuino / CASDuino audio cassette emulator for Sinclair and MSX computers, some require dedicated “shields”, others require considerable use of breadboards and flying wires, more or less simple to make. The one I propose today uses two easily available and inexpensive shields and some external components necessary for connection with the computer. Only a minimum of familiarity with the soldering iron is needed to make the few required connections.

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Parallax Propeller Board

Written July 8th, 2016 by

One of our earliest hardware projects, the Propeller Board is our version of a development and prototyping board for the Parallax Propeller microcontrollers. It uses a Microchip PIC microcontroller as the USB-Serial interface used to program the Propeller and comunicate with the programs. It can be powered via either USB or an external dedicated power source, is equipped with an EEPROM to store the microcontroller’s programs and data and a 2×20 pins connector exposing all 32 I/O pins plus the power and control lines.

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