budget publishers, and other "strong contenders" being Godax, Mandarin and Bug Byte, this assessment made from the perspective of an established games author evaluating trustworthy publishers for aspiring authors. Commercial considerations motivated authors to make their games available for the Electron due to its importance in sales terms, representing "around half of the Acorn market", with it being regarded as "almost compulsory for any mainstream game" to have an Electron version "unless your game is a state-of-the-art masterpiece", with Revs, Cholo and Sentinel cited as such BBC Micro exclusives. Although the Electron imposed additional technical constraints on authors accustomed to the BBC Micro, some authors were able to use this to their creative advantage. For instance, of Frak! it was noted that the "Electron version is more popular, and considered better than the BBC version because it has a screen designer included". Although not as well supported by the biggest software publishers as rivals like the Commodore 64 and Sinclair ZX Spectrum, a good range of games were available for the Electron including popular multi-format games such as Chuckie Egg. There were also many popular games officially converted to the Electron from arcade machines (including Crystal Castles, Tempest, Commando, Paperboy and Yie Ar Kung-Fu) and other home computer systems (including Impossible Mission, Jet Set Willy, The Way of the Exploding Fist, Tetris, The Last Ninja, Barbarian, Ballistix, Predator, Hostages and SimCity). Despite Acorn themselves effectively shelving the Electron in 1985, games continued to be developed and released by professional software houses until the early 1990s. There were around 1,400 games released for the Acorn Electron, several thousand extra public domain titles were released on disc through Public Domain libraries. Notable enterprises which produced discs of such software are BBC PD, EUG (Electron User Group) and HeadFirst PD. Emulation Several emulators of the machine exist: ElectrEm for Windows/Linux/macOS, Elkulator for Windows/Linux/DOS, ElkJS is a browser-based (JavaScript/HTML5) emulator, and the multi-system emulators MESS and Clock Signal feature support for the Electron. Electron software is predominantly archived in the UEF file format. There are also two known FPGA based recreations of the Acorn Electron hardware. ElectronFPGA for the Papilio Duo hardware and the Acorn-Electron core for the FPGA Arcade "Replay" board. Design team The operating system ROM locations 0xFC00-0xFFFF contain the details of some members of the Electron's design team, these differing somewhat from those listed in the corresponding message in the BBC