= Accuracy checking tools =
*[https://cpcrulez.fr/applications_util-zexallzexdoc.htm ZEXDOC ] & [https://cpcrulez.fr/applications_util-zexall.htm ZEXALL] Z80 instruction set exerciserexercisers
*[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=9627 Official Amstrad Plus diagnostics cartridge]