Specifications 6-13
Table 6-15 System I/O Addresses
Continued
I/O Address (Hex) System Function (Shipping Configuration)
170 - 177 Hard drive secondary registers
178 - 1EF Unused
1F0 - 1F7 Hard drive primary registers
1F8 - 1FF Unused
200 - 21F Unused
220 - 22F ESS audio registers (1st possible) (default)
230 - 23F ESS audio registers (2nd possible)
240 - 24F ESS audio registers (3rd possible)
250 - 25F ESS audio registers (4th possible)
260 - 277 Unused
278 - 27A LPT2 and high speed parallel port registers
27B - 27F LPT2 high speed printer port registers
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 ESS FM synthesizer
38C - 3AF Unused
3B0 - 3BB Cirrus logic video controller
3BC - 3BE LPT3 and high speed parallel port registers
3BF LPT1 high speed parallel port registers
3C0 - 3CD Cirrus logic video controller
3D0 - 3DF Cirrus logic video controller
3F0 - 3F7 Diskette drive controller primary registers
3F8 - 3FF COM1 serial controller registers
400 - 4CF Unused
480 - 48F Extended DMS registers
4D0 - CF6 Unused
CF7 Configuration/NVM data register
CF8 - CFB PCI configuration index register
CFC - CFF PCI configuration index register
D00 - FFF Unused
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