This is a collection of files relating to PhotoResearch Spectrascans (mostly PR650 and PR655). **Manuals** Versions of different manuals sent to us when we were first trying to use the PR650 in our lab. **How to use the PR650** A quick how to guide on using the PR650 and what to do if it breaks **Matlab scripts** There is a folder in here with the files referenced in the How To use the PR650 doc. These are the versions which have most recently worked for us - there are a few versions around of different scripts, the most up to date and supported scripts will be found via PsychToolbox. https://psychtoolbox.org/ e.g. for PR650 https://github.com/Psychtoolbox-3/Psychtoolbox-3/commits/master/Psychtoolbox/PsychHardware/PR650Toolbox **PR650 floppy disc files** We used these files when restoring our PR650 when it appeared to have broken. We're more than happy to help if you're in the same situation, please do get in touch with someone at the Sussex Vision Lab / Sussex Colour Group (e.g. Jenny Bosten, j.bosten@sussex.ac.uk, Alice Skelton a.e.skelton@sussex.ac.uk, Chris Racey c.racey@sussex.ac.uk), or if there's something you'd like to contribute to this resource. We are very thankful to Christoph Witzel and Sergio Nacimiento for sharing their knowledge and scripts with us.