IBM 09-0572-000 BIOS/MMIO Address Location, Shared RAM Page Size and Address Range, C0000-C1FFF

Configuration Options B-5

BIOS/MMIO Address Location

There are 16 possible 8 KB blocks of PC memory that can be assigned for accessing the ROM area of the 3C619C adapter. The factory default ROM address for the adapter is CC000–CDFFF. The 16 ROM address locations are as follows, with the default in bold:

C0000–C1FFF	D0000–D1FFF
C2000–C3FFF	D2000–D3FFF
C4000–C5FFF	D4000–D5FFF
C6000–C7FFF	D6000–D7FFF
C8000–C9FFF	D8000–D9FFF
CA000–CBFFF	DA000–DBFFF
CC000–CDFFF	DC000–DDFFF
CE000–CFFFF	DE000–DFFFF

The BIOS/MMIO address selected must not be assigned for use by any other adapter or option and cannot be the same as the RAM address for this adapter. If a system resource conflict exists, you may have to change the settings of other adapters or options that are in your PC.

Shared RAM Page Size and Address Range

There are 30 possible blocks of memory that can be assigned for accessing the RAM located on the 3C619C adapter. The factory default RAM size and address location for the adapter, which support RAM paging, are 16 KB / D8000–DBFFF.

RAM paging allows the software to access all 64 KB of RAM on the adapter one page (16 KB) at a time, while using only 16 KB of PC memory space. RAM paging is available for all 16 KB address ranges.