0FC - 0FF Unused
100 - 101 Unused
103 - 16F Unused
170 - 177 Hard Drive Secondary Registers
178 - 1EF Unused
1F0 - 1F7 Hard Drive Primary Registers
1F8 - 1FF Unused
200 - 21F Unused
220 - 22F Unused
230 - 23F Unused
240 - 24F Unused
250 - 25F Unused
260 - 277 Unused
278 - 27A LPT2 and High Speed Parallel Port Registers
27B - 27F LPT2 High Speed Printer Port Registers
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I/O Address (Hex) System Function (Shipping Configuration)
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280 - 2F7 Unused
2F8 - 2FF Serial Control Register COM2
300 - 36F Unused
370 - 371 Reserved
372 Diskette Digital Output Register
373 Unused
374 Reserved
375 Diskette Main Status/Data Registers
376 Reserved
377 Diskette Input/Control Registers
378 - 37A LPT1 and High Speed Parallel Port Registers
37B - 37F Unused
380 - 387 Unused
388 - 38B Unused
38C - 3AF Unused
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