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Which IO port addresses does the ClassicBoard ISA adapter use? Which IO port addresses does the ClassicBoard ISA adapter use? If the ClassicBoard ISA adapter is in PNP mode, all of the resources are assigned by the PNP system and therefore there should be no conflicts.
If the adapter is in legacy (non-PNP) mode, then the system, upon boot up, will check for PNP devices, will detect the adapter, perform an IO test and assign a non-conflicting IO address as the read-only port.
0x203 is the port address normally assigned as a read-only for the adapter. This is assigned by the system (PNP) and theoretically can be anything from 0x203 to 0x3FF.
The ClassicBoard ISA adapter also uses 2 write-only ports at 0x279 and 0xA79.
IO conflicts can occur if the system PNP assigns a conflicting read-only address. There could also be a conflict at either 0x279 or 0xA79.
Please note that the addresses above are in addition to the addresses assigned to the adapter for it's IO port and Status register addresses. This is true whether the addresses are assigned manually (via the cfg.exe utility) or by the PNP system.
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