PC机I/O端口分配列表
?????? Port addresses are not always constant across PC, AT and PS/2
?????? Unless marked, port addresses are relative to PC and XT only
?????? 000-00F? 8237 DMA controller
?????? 000 Channel 0 address register
?????? 001 Channel 0 word count
?????? 002 Channel 1 address register
?????? 003 Channel 1 word count
?????? 004 Channel 2 address register
?????? 005 Channel 2 word count
?????? 006 Channel 3 address register
?????? 007 Channel 3 word count
?????? 008 Status/command register
?????? 009 Request register
?????? 00A Mask register
?????? 00B Mode register
?????? 00C Clear MSB/LSB flip flop
?????? 00D Master clear temp register
?????? 00E Clear mask register
?????? 00F Multiple mask register
?????? 010-01F? 8237 DMA Controller (PS/2 model 60 & 80), reserved (AT)
?
?????? 020-02F? 8259A Master Programmable Interrupt Controller
?????? 020 8259 Command port? (see 8259)
?????? 021 8259 Interrupt mask register? (see 8259)
?????? 030-03F? 8259A Slave Programmable Interrupt Controller (AT,PS/2)
?
?????? 040-05F? 8253 or 8254 Programmable Interval Timer (PIT, see 8253)
?????? 040 8253 channel 0, counter divisor
?????? 041 8253 channel 1, RAM refresh counter
?????? 042 8253 channel 2, Cassette and speaker functions
?????? 043 8253 mode control? (see 8253)
?????? 044 8254 PS/2 extended timer
?????? 047 8254 Channel 3 control byte
??????060-067? 8255 Programmable Peripheral Interface? (PC,XT, PCjr)
?????? 060 8255 Port A keyboard input/output buffer (output PCjr)
?????? 061 8255 Port B output
?????? 062 8255 Port C input
?????? 063 8255 Command/Mode control register
?????? 060-06F? 8042 Keyboard Controller? (AT,PS/2)
?????? 060 8042 Keyboard input/output buffer register
?????? 061 8042 system control port (for compatability with 8255)
?????? 064 8042 Keyboard command/status register
?????? 070 CMOS RAM/RTC, also NMI enable/disable (AT,PS/2, see RTC)
?????? 071 CMOS RAM data? (AT,PS/2)
?????? 080 Manufacturer systems checkpoint port (used during POST)
??????080-090? DMA Page Registers
?????? 081 High order 4 bits of DMA channel 2 address
?????? 082 High order 4 bits of DMA channel 3 address
?????? 083 High order 4 bits of DMA channel 1 address
??????090-097? POS/Programmable Option Select? (PS/2)
?????? 090 Central arbitration control Port
?????? 091 Card selection feedback
?????? 092 System control and status register
?????? 094 System board enable/setup register
?????? 095 Reserved
?????? 096 Adapter enable/setup register
?????? 097 Reserved
?????? 0A0 NMI Mask Register (PC,XT) (write 80h to enable NMI, 00h disable)
?????? 0A0-0BF? Second 8259 Programmable Interrupt Controller (AT, PS/2)
?????? 0A0 Second 8259 Command port? (see 8259)
?????? 0A1 Second 8259 Interrupt mask register? (see 8259)
?????? 0C0 TI SN76496 Programmable Tone/Noise Generator (PCjr)
??????0C0-0DF? 8237 DMA controller 2 (AT)
?????? 0C2 DMA channel 3 selector? (see ports 6 & 82)
????? ?0E0-0EF? Reserved
?????? 0F0-0FF? Math coprocessor (AT, PS/2)
?????? 0F0-0F5? PCjr Disk Controller
?????? 0F0 Disk Controller
?????? 0F2 Disk Controller control port
?????? 0F4 Disk Controller status register
?????? 0F5 Disk Controller data port
?????? 0F8-0FF? Reserved for future microprocessor extensions
?
?????? 100-10F? POS Programmable Option Select (PS/2)
?????? 100 POS Register 0, Adapter ID byte (LSB)
?????? 101 POS Register 1, Adapter ID byte (MSB)
?????? 102 POS Register 2, Option select data byte 1
?????????? Bit 0 is card enable (CDEN)
?????? 103 POS Register 3, Option select data byte 2
?????? 104 POS Register 4, Option select data byte 3
?????? 105 POS Register 5, Option select data byte 4
?????????? Bit 7 is (-CHCK)
?????????? Bit 6 is reserved
?????? 106 POS Register 6, subaddress extension (LSB)
?????? 107 POS Register 7, subaddress extension (MSB)
?????? 110-1EF? System I/O channel
?
?????? 170-17F? Fixed disk 1 (AT)
?????? 170 disk 1 data
?????? 171 disk 1 error
?????? 172 disk 1 sector count
?????? 173 disk 1 sector number
?????? 174 disk 1 cylinder low
?????? 175 disk 1 cylinder high
?????? 176 disk 1 drive/head
?????? 177 disk 1 status
?????? 1F0-1FF? Fixed disk 0 (AT)
?????? 1F0 disk 0 data
?????? 1F1 disk 0 error
?????? 1F2 disk 0 sector count
?????? 1F3 disk 0 sector number
?????? 1F4 disk 0 cylinder low
?????? 1F5 disk 0 cylinder high
?????? 1F6 disk 0 drive/head
?????? 1F7 disk 0 status
?????? 200-20F? Game Adapter (see GAME PORT or JOYSTICK)
?
?????? 210-217? Expansion Card Ports (XT)
?????? 210 Write: latch expansion bus data
?????????? read:? verify expansion bus data
?????? 211 Write: clear wait,test latch
?????????? Read:? MSB of data address
?????? 212 Read:? LSB of data address
?????? 213 Write: 0=enable, 1=/disable expansion unit
?????? 214-215? Receiver Card Ports
?????? 214 write: latch data, read: data
?????? 215 read:? MSB of address, next read: LSB of address
?????? 21F Reserved
?????? 220-26F? Reserved for I/O channel
?
?????? 270-27F? Third parallel port (see PARALLEL PORT)
?????? 278 data port
?????? 279 status port
?????? 27A control port
?????? 280-2AF? Reserved for I/O channel
?
?????? 2A2-2A3? MSM58321RS clock
?
?????? 2B0-2DF? Alternate EGA, or 3270 PC video (XT, AT)
?????? 2E0 Alternate EGA/VGA
?????? 2E1 GPIB Adapter? (AT)
?????? 2E2-2E3? Data acquisition adapter (AT)
?
?????? 2E8-2EF? COM4 non PS/2 UART (Reserved by IBM) (see UART)
?
?????? 2F0-2F7? Reserved
?
?????? 2F8-2FF? COM2 Second Asynchronous Adapter (see UART)
??????????????? Primary Asynchronous Adapter for PCjr
?????? 300-31F? Prototype Experimentation Card (except PCjr)
??????????????? Periscope hardware debugger
?????? 320-32F? Hard Disk Controller? (XT)
?????? 320 Read from/Write to controller
?????? 321 Read: Controller Status, Write: controller reset
?????? 322 Write: generate controller select pulse
?????? 323 Write: Pattern to DMA and interrupt mask register
?????????? (see ports 0F,21,C2)
?????? 324 disk attention/status
??????330-33F? Reserved for XT/370
?
??????340-35F? Reserved for I/O channel
?
???? ?360-36F? PC Network
?
????? 370-377? Floppy disk controller (except PCjr)
?????? 372 Diskette digital output
?????? 374 Diskette controller status
?????? 375 Diskette controller data
?????? 376 Diskette controller data
?????? 377 Diskette digital input
?????? 378-37F? Second Parallel Printer (see PARALLEL PORT)
??????????????? First Parallel Printer (see PARALLEL PORT)
?????? 378 data port
?????? 379 status port
?????? 37A control port
?????? 380-38F? Secondary Binary Synchronous Data Link Control (SDLC) adapter
?????? 380 On board 8255 port A, internal/external sense
?????? 381 On board 8255 port B, external modem interface
?????? 382 On board 8255 port C, internal control and gating
?????? 383 On board 8255 mode register
?????? 384 On board 8253 channel square wave generator
?????? 385 On board 8253 channel 1 inactivity time-out
?????? 386 On board 8253 channel 2 inactivity time-out
?????? 387 On board 8253 mode register
?????? 388 On board 8273 read: status; Write: Command
?????? 389 On board 8273 write: parameter; read: response
?????? 38A On board 8273 transmit interrupt status
?????? 38B On board 8273 receiver interrupt status
?????? 38C On board 8273 data
?????? 390-39F? Cluster Adapter
?
?????? 3A0-3AF? Primary Binary Synchronous Data Link Control (SDLC) adapter
?????? 3A0 On board 8255 port A, internal/external sense
?????? 3A1 On board 8255 port B, external modem interface
?????? 3A2 On board 8255 port C, internal control and gating
?????? 3A3 On board 8255 mode register
?????? 3A4 On board 8253 counter 0 unused
?????? 3A5 On board 8253 counter 1 inactivity time-outs
?????? 3A6 On board 8253 counter 2 inactivity time-outs
?????? 3A7 On board 8253 mode register
?????? 3A8 On board 8251 data
?????? 3A9 On board 8251 command/mode/status register
??????3B0-3BF Monochrome Display Adapter (write only, see 6845)
?????? 3B0 port address decodes to 3B4
?????? 3B1 port address decodes to 3B5
?????? 3B2 port address decodes to 3B4
?????? 3B3 port address decodes to 3B5
?????? 3B4 6845 index register, selects which register [0-11h]
?????????? is to be accessed through port 3B5
?????? 3B5 6845 data register [0-11h] selected by port 3B4,
?????????? registers 0C-0F may be read.? If a read occurs without
?????????? the adapter installed, FFh is returned.? (see 6845)
?????? 3B6 port address decodes to 3B4
?????? 3B7 port address decodes to 3B5
?????? 3B8 6845 Mode control register
?????? 3B9 reserved for color select register on color adapter
?????? 3BA status register (read only)
?????? 3BB reserved for light pen strobe reset
???????3BC-3BF? Primary Parallel Printer Adapter (see PARALLEL PORT)
?????? 3BC parallel 1, data port
?????? 3BD parallel 1, status port
?????? 3BE parallel 1, control port
???????3C0-3CF? EGA/VGA
?????? 3C0 VGA attribute and sequencer register
?????? 3C1 Other video attributes
?????? 3C2 EGA, VGA, CGA input status 0
?????? 3C3 Video subsystem enable
?????? 3C4 CGA, EGA, VGA sequencer index
?????? 3C5 CGA, EGA, VGA sequencer
?????? 3C6 VGA video DAC PEL mask
?????? 3C7 VGA video DAC state
?????? 3C8 VGA video DAC PEL address
?????? 3C9 VGA video DAC
?????? 3CA VGA graphics 2 position
?????? 3CC VGA graphics 1 position
?????? 3CD VGA feature control
?????? 3CE VGA graphics index
?????? 3CF Other VGA graphics
?????? 3D0-3DF Color Graphics Monitor Adapter (ports 3D0-3DB are write only, see 6845)
?????? 3D0 port address decodes to 3D4
?????? 3D1 port address decodes to 3D5
?????? 3D2 port address decodes to 3D4
?????? 3D3 port address decodes to 3D5
?????? 3D4 6845 index register, selects which register [0-11h]
?????????? is to be accessed through port 3D5
?????? 3D5 6845 data register [0-11h] selected by port 3D4,
?????????? registers 0C-0F may be read.? If a read occurs without
?????????? the adapter installed, FFh is returned.? (see 6845)
?????? 3D6 port address decodes to 3D4
?????? 3D7 port address decodes to 3D5
?????? 3D8 6845 Mode control register (CGA, EGA, VGA, except PCjr)
?????? 3D9 color select palette register (CGA, EGA, VGA, see 6845)
?????? 3DA status register (read only, see 6845, PCjr VGA access)
?????? 3DB Clear light pen latch (any write)
?????? 3DC Preset Light pen latch
?????? 3DF CRT/CPU page register (PCjr only)
? ?????3E8-3EF? COM3 non PS/2 UART (Reserved by IBM) (see UART)
?
?????? 3F0-3F7? Floppy disk controller (except PCjr)
?????? 3F0 Diskette controller status A
?????? 3F1 Diskette controller status B
?????? 3F2 controller control port
?????? 3F4 controller status register
?????? 3F5 data register (write 1-9 byte command, see INT 13)
?????? 3F6 Diskette controller data
?????? 3F7 Diskette digital input
?????? 3F8-3FF? COM1 Primary Asynchronous Adapter? (see UART)
?
?????? 3220-3227? PS/2 COM3 (see UART)
?????? 3228-322F? PS/2 COM4 (see UART)
?????? 4220-4227? PS/2 COM5 (see UART)
?????? 4228-422F? PS/2 COM6 (see UART)
?????? 5220-5227? PS/2 COM7 (see UART)
?????? 5228-522F? PS/2 COM8 (see UART)
?????? - many cards designed for the ISA BUS only uses the lower 10 bits
???????? of the port address but some ISA adapters use addresses beyond
???????? 3FF.? Any address that matches in the lower 10 bits will decode
???????? to the same card.?? It is up to the adapters to resolve or ignore
???????? the high bits of the port addresses.?? An example would be the
???????? Cluster adapter that has a port address of 390h.? The second
???????? cluster adapter has a port address of 790h which resolves to
???????? the same port address with the cards determining which one
???????? actually gets the data.
轉載于:https://www.cnblogs.com/pianoid/archive/2011/04/26/2029757.html
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