== Diagnostics ==
*[https://www.cpc-power.com/index.php?page=detail&num=5113 Official Amstrad CPC hardware diagnostics] [https://www.cpc-power.com/index.php?page=detail&num=17932 Non-official Amstrad Diagnostics v1.3a] [https://www.cpc-power.com/index.php?page=detail&num=6545 STS SysInfo]
*[https://www.cpc-power.com/index.php?page=detail&num=6987 RAM Expansion Test] [https://www.cpc-power.com/index.php?page=detail&num=14833 MemTest] [https://www.cpc-power.com/index.php?page=detail&num=14834 RAM Test CRTC4] [https://www.cpc-power.com/index.php?page=detail&num=15739 RAM Check][https://www.cpc-power.com/index.php?page=detail&num=13386 Testprogram For All ERAM] [https://www.cpc-power.com/index.php?page=detail&num=19185 Xenon 2] [https://www.cpc-power.com/index.php?page=detail&num=12188 Take On Me] [https://www.cpc-power.com/index.php?page=detail&num=16084 Post Scriptum] RAM testers
*[https://www.cpc-power.com/index.php?page=detail&num=15975 FutureOS] [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/upgrading-a-cpc-464-in-2022/ Technical information] RAM mode &C3 issue on CPC464/664