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== Timings and relating with Z80 instructions count I/O access timings ==
Some informations like : how many Z80 instructions can {| class="wikitable"|+! Instructions !! Duration !! I fit within a scan line ? Within a screen ? Etc... See http:/O CRTCs 0/www.cpcwiki.eu1/forum2 !! I/programmingO CRTCs 3/frame4|-flyback| OUT (C),r8 || 4 µsec || '''3rd µsec''' || 4th µsec|-and| OUT (C),0 || 4 µsec || '''3rd µsec''' || 4th µsec|-interrupts/msg25106/#msg25106| OUT (To be extracted/edited to conform to wiki good practicesn).,A || 3 µsec || 3rd µsec || 3rd µsec|-| OUTI || 5 µsec || 5th µsec || 5th µsec|-| OUTD || 5 µsec || 5th µsec || 5th µsec|-| IN r8,(C) || 4 µsec || 4th µsec || 4th µsec|-| INI || 5 µsec || '''4th µsec''' || '''4th µsec'''|-| IND || 5 µsec || '''4th µsec''' || '''4th µsec'''|-| IN A,(n) || 3 µsec || 3rd µsec || 3rd µsec|}
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