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000h - 00Fh       DMA 8237A
020h - 021h       Interupt controller 8259
040h - 043h       Timer 8253
060h - 063h       PIO 8255
064h              (AT) Keyboard Command Port
066h - 067h       (Some PC's) Configuration Switches
070h - 071        (AT) RealTime Clock and CMOS-RAM, MC146818
080h - 083h       DMA Page registers (AT - 087h)
08Eh              (AT) Battery Test (bits 6 & 7)
0A0h              (PC) NMI enable register
0A0h - 0A1h       (AT) Slave Interupt Controller, 8259
0C0h - 0CFh       (AT) DMA-Controller for 16-bit transfers, 8237A
0F0h - 0FFh       Math CO-Processor, 80x87
     - 1FFh       Reserved
200h - 20Fh       Game control
210h - 217h       Expansion unit
220h - 24Fh       Reserved
258h - 259h       Peel development system (PDS)
268h - 26Fh       Copy II PC deluxe option board (1)
278h - 27Fh       LPT 2
2B0h - 2DFh       Alternate EGA
2E0h - 2EFh       PCANET
2E1h              GPIB adapter #0
2E2h & 2E3h       Data acquisition #0
2E8h - 2EFh       COM 4
2F0h - 2F7h       Reserved
2F8h - 2FFh       COM 2
300h - 31Fh       Prototype card
300h - 303h       PC-I/O Port #1
320h - 32Fh       Hard disk adapter
348h - 357h       DCA 3278
360h - 367h       PC Network (low)
368h - 36Fh       PC Network (high)
378h - 37Fh       LPT 1
380h - 389h       BISYNC adapter #2
380h - 38Fh       SDLC communications adapter
390h - 393h       Cluster adapter #0
3A0h - 3A9h       BISYNC adapter #1
3AAh - 3AFh       Reserved
3B0h - 3BFh       Monochrome display adapter and printer
3C0h - 3CFh       EGA
3D0h - 3DFh       Color graphics adapter
3E8h - 3EFh       COM 3
3F0h - 3F7h       Floppy disk adapter
3F8h - 3FFh       COM 1

6E2h & 6E3h       Data acquisition #1
790h - 793h       Cluster adaptor #1
AE2h & AE3h       Data acquisition #2
B90h - B93h       Cluster adaptor #2
EE2h & EE3h       Data acquisition #3
1390h - 1393h     Cluster adaptor #3
22E1h             GPIB adaptor #1
2390h - 2393h     Cluster adaptor #4
42E1h             GPIB adaptor #2
62E1h             GPIB adaptor #3
82E1h             GPIB adaptor #4
A2E1h             GPIB adaptor #5
C2E1h             GPIB adaptor #6
E2E1h             GPIB adaptor #7