|#FBE7||?||RS Port - [[IDE8255]]||?||?
|-
|#FBE7||?||[[ACU Real Time Clock Z80-PIO (DIY)]]Z80-PIO Data In/Out Port A]] ||Read||Write
|-
|#FBE8||?||[[Dk'tronics Real Time Clock]]||?||?
|#FBEF||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 6850 (reversed bit-order) RX Data||Read||-
|-
|#FBEF||?||[[ACU Real Time Clock Z80-PIO (DIY)]]Z80-PIO 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)]]Z80-PIO 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)]]Z80-PIO Configure Port B]] ||Read||Write
|-