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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
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Written by Dave Pearson