DJL: Difference between revisions

Latest revision as of 05:05, 13 February 2022

DJL Software (for "Dave and John Looker Software") is mainly known as the co-author of the Speedlock protection system.

A fast loader and protection used on many cassette games, and as a protection on disc games.

DJL was also the author of several Amstrad games including 3d Stunt Rider and Nigel Mansell's Grand Prix, in addition to self-published titles such as [Frogger].

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-DJL (Dave J Looker) was the author of the [[Speedlock]] protection system, used on many cassette games released in the UK. Speedlock was a modified version of the [[Spectrum]]'s cassette routines with protection added.
+DJL Software (for "Dave and John Looker Software") is mainly known as the co-author of the [[Speedlock|Speedlock]] protection system.
-As the protection system continued to evolve, programs such as [[Soft-Lok]] and the [[Bonzo]] suite were upgraded to break the protection.
+A fast loader and protection used on many cassette games, and as a protection on disc games.
-A separate disc protection system, [[8k Speedlock]], relied on the fact that the CPC's hardware could reliably read but not write 8k sectors. To get around this, the [[Executioner]]'s utility [[Xexor]] included a 'brain file' solution to crack individual games before copying them.
+DJL was also the author of several Amstrad games including [[3d Stunt Rider]] and [[Nigel Mansell's Grand Prix]], in addition to self-published titles such as [[https://www.retrogames.co.uk/041976/Sinclair/Frogger-by-DJL-Software Frogger]].
+[[Category:CPC scene members]]