Resource centre for ZX Spectrum games
      using Manic Miner and Jet Set Willy game engines

 

Versions and minor mods of the original Jet Set Willy

 

Jet Set Willy - Mark Woodmass's fast version

Author: Mark Woodmass

Year: 2002

Language: English

 

A version which speeds up the frame rate by replacing the slow LDIR instructions in the JSW game engine with a stack method to copy the screen data to the Spectrum's video RAM. Mark Woodmass described the game as being "marginally faster but not as much as he'd hoped for". However, his modification does make a difference to the speed of the game.

The changes to the game engine provoke a critical problem with the ropes, because the stack-copying code overwrites the rope trajectory data at #8300. John Elliott has released a patch to fix this bug.

Apart from running faster, the game is not different from the original JSW in any other way.

 

 

Download links

 

Original release	Original ZIP with the author's notes and the game file in TAP format, impossible to complete because of the bugs present in the original JSW and the ropes problem
John Elliott's homepage	John Elliott's patch which fixes the ropes problem
JSW Central	Ready-to-play, completable game file in TAP and TZX formats plus the Readme
Direct game download	Game file (fixed version) in TAP and TZX formats

 

 

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