*[https://www.cpc-power.com/index.php?page=detail&num=9627 Official Amstrad Plus diagnostics cartridge]
*[https://www.cpc-power.com/index.php?page=detail&num=17932 Amstrad Diagnostics v1.3a] Test RAM, ROM, keyboard and detect CRTC
*[http://www.winape.net/downloads.jsp Plus Test] CPC/and CPC+ Emulator test suite (including Instruction and Interrupt timing tests)
*[https://cpcrulez.fr/book-amstrad_cpc_crtc_compendium.htm Amstrad CPC CRTC Compendium v1.6] Ultra accurate CRTC documentation
*[https://web.archive.org/web/20230330143252/http://logonsystem.fr/html/downloadlogon.htm Shaker v2.4] [https://cpcrulez.fr/applications_util-cpc_shaker.htm] Testing tool for the Amstrad CPC CRTC Compendium