How to play Quadron on Mac

"Quadron is an original arcade style game for the 48K ZX Spectrum created in the mould of the 1980s Williams classics. Set in the Quadron complex, you are charged with the task of defending the crystals mined by the relentless onset of marauding aliens. Featuring fast arcade style gameplay, multiple weapons, enemies, collectables, powerups, and a pointer based status screen and scanner, the game calls for both fast reactions and a surprising dose of strategy!" "The game was written in assembler on the Spectrum over the course of two years and completed in early 1988. Sadly, the publisher (now defunct) pulled out towards the end of development and the game remained unreleased along with its plans for an Amstrad CPC conversion. Now on its 30th anniversary I'm making it available for anyone interested. While I don't have access to the original source code, I do have many of my original notes and have been working with the disassembly to prepare the game for release with a few tweaks and bug fixes. As part of the downloads I've also made available scans of the basic and detailed instruction printouts from 1987, complete with the original spelling / grammatical errors!"