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Chris Johnson's Software Versions

Started 25th January 2026

Over the years Chris Johnson, using the original source code, produced enhanced versions of a number of pieces of RISC OS software written by David Pilling. This page makes available the source code of Chris's improved versions. The archives also contain copies of the applications which are usable without any programming expertise.

The software is DPScan (bitmap image manipulation) (DP version, CJ version), snapper (screen capture) (DP version, CJ version), sync discs (make contents of folders equal) (DP version, CJ version), TaskLib (library needed to build the applications) (DP version also called XL) and some bitmap image libraries required for Snapper and DPScan. The DP versions of these image libraries are contained in the DP version of the DPScan sources.

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• Chris Johnson's TaskLib, RISC OS library with source code 24th February 2026
• Chris Johnson's Snapper, RISC OS application with source code 1.34 13th May 2022 Archive updated 24th February 2026.
• Chris Johnsons's Syncdiscs, RISC OS application with source code 1.30 9th January 2026 Archive updated 24th February 2026.
• Chris Johnsons's DPScan, RISC OS application with source code 1.35 31st March 2026 Archive updated 18th April 2026.
• Chris Johnsons's Image libraries, RISC OS libraries with source code Archive updated 18th April 2026. Includes TIFF, PNG, JPEG, TWAIN and Zlib, these are needed to build Snapper and DPScan.

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