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- I/O Ports on IBM Compatibles
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- Collected by William C. Parke for the Capitol Heath Users' Group, 1986
-
- The folling list gives the input and output ports used by IBM PC compatible
- computers. Most ports allow access to input and output controllers. A
- controller may have several internal registers which can be set to fix
- the operation of that controller or read to find its status.
-
- Name of Port Address Chip Server if present
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- DMA Processor 000-00F 8237-5 DMA Chip
- Interrupt Generation 020-021 8259A Interrupt Processor
- System Timer 040-043 8253-5 System Timer and speaker audio
- PPI Status Port 060-063 PPI 8255A-5, Read switches SW1, SW2
- DMA Page Registers 080-083 8237A Controller
- NMI Mask Registers 0A0-0AF Out 80H to enable NMI, 0 to disable
- Reserved 0C0-0CF
- Reserved 0E0-0EF
- Game I/O Ports 200-20F
- Serial #8 option 248-24F [8250 ACE] ref. JRAM card
- Serial #6 option 268-26F [8250 ACE]
- Parallel # 2 278-27F 8255 chip
- Clock option 2A2-2A3 MSM58321RS
- Serial #4 option 2E8-2EF [8250 ACE]
- Serial #2 2F8-2FF 8250 ACE used with IRQ3
- Serial #7 option 348-34F [8250 ACE]
- Serial #5 option 368-36F [8250 ACE]
- Parallel # 1 378-37F 8255 chip
- Mono. Monitor 3B0-3BB 46505 chip
- Printer # 0 3BC-3BF 8255 chip
- Color graphics control 3D0-3DF 6845 chip
- Serial #3 option 3E8-3EF [8250 ACE] use with IRQ2 except for EGA card
- Diskette Controller 3F0-3F7 mPD765AC
- Serial #1 3F8-3FF 8250 ACE used with IRQ4
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