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DEFINITION OF 8086 PORTS June 5, 1979 lOP PORTS Address RAV Bits Description 0002 R/W 8-15 Interrupt Control Register 8 Select 60 Hz Interrupt 9 Se1ect Key Board Internlpt 10 Select AID Converter Intcrfilpt 11 Select 30 Hz Display Inte~rupt 12 Select EIA Interrupt 13 Select Disk Controller Interrupt 14 Select System Interrupt 15 Select wI ain Niemory Parity Interrupt 0020 'tV 8-15 Processor Control Register 8 Boot Sequence Done 9 Processor Lock 10 Battery Charger On 11 Disabic ROrvr(Enable Ivlain lvlcmury) 12 Correction Off & CR4 Off(msb) 13 CR30fr 14 CR2 orr 15 CR1 Off(lsb) 0042 R 8-15 Read Key Board Data 0044 R 12-15 Read KeyBoard/FIFO Status 12 FIFO Out Ready 13 FIFO In Ready 14 Data Received 15 Data Sent 0048 W 8-15 UART+- KBD Control Register 004A W 8-15 UART +- KBD Data(Turn KBD On) 004C W KI3D Data Reset 004E W KBD Chip Reset 0060 \V 0 Set D/A FIFO Sample & Hold 1 Select D/A Sample & Hold Channel A 2 Select DI A Sample & Hold Channel B 3 Select 01 A FIFO Frequency 0 4 Select DI A FIFO Frequency 1 5 Select DIA FIFO Frequency 2 6 Tablet X On 7 Tablet Y On 2 Address U/\V Hits Description OOAO W- 8-15 DataBus to PPI Interface PortA OOAO R 8-15 PPI Interface PortA to DataBus 00A2 'N 8-15 DataBus to PPI Interface PortB 00A2 R 8-15 PPI Interface PortB to DataBus 00A4 W 8-15 DataBus to PPI Interface PortC 00A4 R 8-15 PPI Interface PortC to Data Bus 8 Bit Set/Reset Flag(O=active) 9-11 Dant Care 12-14 Bit Selcct(O-7) 15 Bit Set/Rcset(O = reset;l = set) 00A6 W 8-15 Load PPI Control Register with Mode Def. 8 _Mode Set Flag(l = active) 9-10 Group A-Mode Selection OO=~ilode 0;01 = Mode 1:1x=Mode 2 11 Group A-Port A(O = output;1 = input) 12 Group A-Port C-Upper(O = output;1 = input) -