IBM Aptiva, Hardware Maintenance Manual, Page: 27 / 282

1-10
Memory Map
This table shows the hexadecimal addresses for the system memory regions.
You may use this information for adapter cards that require you to set up
memory regions.
Table 1- 2 Memory Map Table
Address range Description
0~512 KB
(000000 ~ 07FFFF) Base memory
512~640 KB
(080000 ~ 09FFFF) Host/PCI memory
640~768 KB
(0A0000 ~ 0BFFFF) PCI/ISA video buffer memory
768~800 KB
(0C0000 ~ 0C7FFF) Video BIOS memory
800~896 KB
(0C8000 ~ 0DFFFF) ISA card BIOS and buffer memory
896~960 KB
(0E0000 ~ 0EFFFF) BIOS extension memory
Setup and POST memory
PCI development BIOS
960~1024 KB
(0F0000 ~ 0FFFFF) System BIOS memory
1024 KB ~ Upper Limit Main memory
Upper Limit ~ 4 GB PCI memory
System Input / Output Addresses
This table shows the hexadecimal addresses for each of the system board
input/output (I/O) functions. You may use this information for adapter cards
that require you to set up I/O addresses.
Table 1- 3 System Input / Output Addresses Table
Address range
(hexadecimal) Function
0000-001F DMA controller 1
0020-003F Interrupt controller 1