|-
|#FAEE||?||[[Amstrad SSA-1 Speech Synthesizer]] (faulty mirror used by included RSX driver)||Read||Write
|-
|#FAEF||?||[[Kempston Mouse]] - Mouse Buttons||Read||-
|-
|#FB7E||%xxxxx0x1 0xxxxxx0||[[765 FDC]] (internal) Status Register||Read|| -
|-
|#FBEE||?||[[Amstrad SSA-1 Speech Synthesizer]]||Read||Write
|-
|#FBEE||?||[[Kempston Mouse]] - 8bit X position||Read||-
|-
|#FBEE||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 6850 (reversed bit-order) Status||Read||-
|-
|#FBEF||?||[[Kempston Mouse]] - 8bit Y position||Read||-
|-
|#FBEF||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 6850 (reversed bit-order) RX Data||Read||-