The original source for the 1981 masterpiece “Defender” is now on Github! #Gaming #Arcade

The original source for Eugene Jarvis and Sam Dicker’s 1981 masterpiece “Defender” has been put on GitHub this week!

The source code can be assembled into an executable that you can then run in Windows or Linux. You can also assemble it into the 11 rom files that would have been loaded onto the arcade cabinet’s ROM board. Today, these rom files can be used to play the game in an emulator such as MAME.

The game source code for Defender in /src was originally retrieved from https://github.com/historicalsource/defender. It is the Motorola 6809 assembly language source code for the ‘Red Label’ version of the game.

The source code for the sound module was retrieved from https://github.com/historicalsource/williams-soundroms.

Since the RASM assembler is no longer available to us we use asm6809 instead. Fortunately this does a good job of assembling the source faithfully and only very minor modifications to the source files are required to produce binaries.

Check out the GitHub repo for details.


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 30,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


Maker Business — Pololu’s account of the chip shortage

Wearables — More manicure tools for rugged circuits

Electronics — Probes aren’t perfect!

Python for Microcontrollers — Python on Microcontrollers Newsletter: CircuitPython Multitasking, Dune Gom Jabbar and more! #Python #Adafruit #CircuitPython @micropython @ThePSF

Adafruit IoT Monthly — Coffee Routine, IoT Cat, ESP32-S2 Feather, and more!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — New Products 12/1/21 feat. Adafruit Gift Certificates!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



1 Comment

  1. Just wanted to see if I pass the resistor captcha.

Sorry, the comment form is closed at this time.