Note: While most of these devices can be reached via a range of addresses due to the partial address decoding, code should never use any address other than the canonical one (all 'x'/don't care positions filled by 1's). Otherwise multiple devices will be enabled simultaneously, which is unlikely to be what you want.
{|{{Prettytable|width: 700px; font-size: 2em;}}class="wikitable"|'''!I/O'''||'''!Decoded as'''||'''!Port'''||'''!Read'''||'''!Write'''
|-
|#1C00||%x0xxxx00 xxxxxxxx||[[Dk'tronics Lightpen]] faulty mirror of #BCXX [[CRTC]] Index|| - ||Write
|-
|-
|#F8F2F8F3||?||[[EMR MIDI Interface]]||Read||Write
|-
|#F8F4||?||[[Music Machine]] ADC Read||Read|| -
|-
|#FBEE||?||[[Amstrad SSA-1 Speech Synthesizer]]||Read||Write
|-
|#FBEE||?||[[LambdaSpeak III ROM|LambdaSpeak Speech Synthesizer]]||Read||Write
|-
|#FBEE||%xxxxx0x1 xxx0xxx0||[[Kempston Mouse]] - 8bit X position||Read||-
|#FE82||%11111110 10000010||[[Nova]] RTC & NVRAM|| - ||Write
|-
|#FE84 - #FEA7||%11111110 10xxx1xx||[http://shinra.cpcscene.net/willy.html [Willy]] Future use or multi-soundchip ||-||-
|-
|#FEAC - #FEAD||%11111110 101011xx||[http://shinra.cpcscene.net/willy.html [Willy] S2P Dream SAM2965 ] MIDI synthetizer ||Read||Write
|-
|#FEB0 - #FEB7||%11111110 10110xxx||[[Albireo]] serial port||Read||Write
|-
|#FEBC - #FEBF||%11111110 101111xx||[http://shinra.cpcscene.net/willy.html [Willy]] OPL3 soundcard ||-||Write
|-
|#FEE6||?||Port A - [[IDE8255]]||Read||Write
|#FEF0 - #FEF7||%11111110 11110xxx||[[uIDE 16]] - IDE registers||Read||Write
|-
|#FF00 - #FFFF||%11111111 xxxxxxxx||[[AMSDAP ]] (Amstrad MSx aDAPter, MSX-to-CPC I/O hardware interface (MSX ports #00-#ff)||Read||Write
|-
|#FF20 - #FF27||%11111111 00100xxx||MP3MSX (MP3 player) via AMSDAP||Read||Write
== Memory Mapped I/O Ports ==
{|{{Prettytable|width: 700px; font-size: 2em;}}class="wikitable"|'''!Mem'''||'''!Decoded as'''||'''!Port'''||'''!Read'''||'''!Write'''
|-
|#4000-7FFF||%01xxxxxx xxxxxxxx||[[ASIC]] - CPC+/GX4000 registers|| Read || Write
== More Ports ==
Some more I/O addresses (which aren't included in the above list yet) are here:
* [[Schneiderware Summary]]
* [[CPCISA]]
== Other I/O Ports ==