|#FBxx+1||?||CPCI [[Real Time Clock]] Data (DIY)||Read||Write
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|#FBE0 - #FBE3||?||[[Dk'tronics Real Time Clock]]- Z80 PIO Port A Data (HD146818P RTC Data bus)||?Read ||?Write
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|#FBE0||?||[[Dobbertin Harddisc]] Data Port||Read||Write
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|#FBE1||?||[[Dk'tronics Real Time Clock]] - Z80 PIO Port B Data (General Purpose 8bit I/O Port)|| Read || Write
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|#FBE1||?||[[Dobbertin Harddisc]] Status, Reset||Read||Write
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|#FBE2||?||[[Dk'tronics Real Time Clock]] - Z80 PIO Port A Control||?|| Write
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|#FBE2||?||[[Dobbertin Harddisc]] Select, Configuration||Read||Write
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|#FBE3||?||[[Dk'tronics Real Time Clock]] - Z80 PIO Port B Control||?|| Write
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|#FBE3||?||[[Dobbertin Harddisc]] DMA, Interrupt||Read||Write
|#FBE7||?||[[ACU Real Time Clock (DIY)]] Z80-PIO Data In/Out Port A ||Read||Write
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|#FBE8||?||[[Dk'tronics Real Time Clock]]"4bit latch" (details unknown)||?||?Write
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|#FBE8||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 8253 Timer0 (RX Clock)||Read||Write