|-
|#FBE7||?||RS Port - [[IDE8255]]||?||?
|-
|#FBE7||?||[[ACU Real Time Clock Z80-PIO (DIY)]]Data In/Out Port A]] ||Read||Write
|-
|#FBE8||?||[[Dk'tronics Real Time Clock]]||?||?
|-
|#FBED||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 6850 (reversed bit-order) TX Data||-||Write
|-
|#FBEE||?||[[Amstrad SSA-1 Speech Synthesizer]]||Read||Write
|-
|#FBEE||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 6850 (reversed bit-order) Status||Read||-
|#FBEF||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 6850 (reversed bit-order) RX Data||Read||-
|-
|#FBEEFBEF||?||[[Amstrad SSAACU Real Time Clock Z80-1 Speech SynthesizerPIO (DIY)]]Data In/Out Port B]]||Read||Write
|-
|#FBF0 - #FBFF||?||[[Otten & Fecht 1 MB RAM-Disc]]||Read||Write
|-
|#FBF7||?||[[Vortex Disc Drives]] 765 FDC (Vortex,ext) Data Register||Read||Write
|-
|#FBF7||?||[[ACU Real Time Clock Z80-PIO (DIY)]]Configure Port A]] ||Read||Write
|-
|#FBFE||?||[[Amstrad Magnum Phaser|Magnum Light Phaser]]||-||Write
|-
|#FBFF||?||[[TMPI speech synthesizer]] Command/Status Register ||Read||Write
|-
|#FBFF||?||[[ACU Real Time Clock Z80-PIO (DIY)]]Configure Port B]] ||Read||Write
|-
|#FC00 - #FDFF||%1111110x xxxxxxxx||[[CPCISA by Yarek|CPCISA]] 16bits mode high byte latch||Read||Write