Lenovo ThinkPad 560E TP 560Z Technical Reference Manual - Page 32

Memory, ROM Subsystem, RAM Subsystem

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Memory The ThinkPad computers use the following types of memory: Read-only memory (ROM) Random access memory (RAM) Real-time clock/complementary metal-oxide semiconductor RAM (RT/CMOS RAM) ROM Subsystem The ROM subsystem consists of four banks of 128-KB memory. ROM is active when power is turned on and is assigned to the top of the first and last 1MB of address space (X'000F0000'-X'000FFFFF' and X'FFFF0000'-X'FFFFFFFF'). After POST checks that system memory is operating correctly, the ROM code is copied to RAM at the same address space, and ROM is disabled. RAM Subsystem The RAM subsystem on the system board starts at address X'00000000' of the address space. The RAM subsystem for the ThinkPad 560Z is 64 bits wide. The 32-MB or 64-MB base memory is on the system board. One 144-pin 8-byte dual inline memory module (DIMM) connector is provided on the system board. This connector accepts a 16-MB, 32-MB, or 64-MB EDO type DIMM. The memory capacity can be increased up to 96 MB or 128 MB when a DIMM is used (see "System Board Memory Connector for DIMM" on page 2-15). The total amount of usable memory is less than the amount of memory installed because of ROM-to-RAM remapping and power management. 2-14 ThinkPad 560Z System Board

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Memory
The ThinkPad computers use the following types of memory:
±
Read-only memory (ROM)
±
Random access memory (RAM)
±
Real-time clock/complementary metal-oxide semiconductor RAM
(RT/CMOS RAM)
ROM Subsystem
The ROM subsystem consists of four banks of 128-KB memory.
ROM is active when power is turned on and is assigned to the top of
the first and last 1MB of address space
(X
'
000F0000
'
–X
'
000FFFFF
'
and X
'
FFFF0000
'
–X
'
FFFFFFFF
'
).
After POST checks that system memory is operating correctly, the
ROM code is copied to RAM at the same address space, and ROM
is disabled.
RAM Subsystem
The RAM subsystem on the system board starts at address
X
'
00000000
'
of the address space.
The RAM subsystem for the
ThinkPad 560Z is 64 bits wide.
The 32-MB or 64-MB base memory is on the system board.
One
144-pin 8-byte dual inline memory module (DIMM) connector is
provided on the system board.
This connector accepts a 16-MB,
32-MB, or 64-MB EDO type DIMM.
The memory capacity can be
increased up to 96 MB or 128 MB when a DIMM is used (see
“System Board Memory Connector for DIMM” on page
2-15).
The total amount of usable memory is less than the amount of
memory installed because of ROM-to-RAM remapping and power
management.
2-14
ThinkPad 560Z System Board