Manuals

Memory: Dell Dimension P133a, P166a, M166a, M200a, and M233a

Memory Installation Guidelines | DIMM Configurations | Installing/Removing Memory | Upper Memory Map | Conventional Memory Map | Flash Memory Implementation

Memory Installation Guidelines

The system board provides two 168-pin, 3.3-V DIMM sockets for memory expansion. The sockets support 2 M x 64 (16 MB) and 4 M x 64 (32 MB) DIMM modules. The maximum memory size, using two 4 M x 64 SDRAM DIMM modules, is 64 MB. Memory timing requires 67-MHz (or higher) SDRAM or 60-ns EDO devices. Gold-plated (>= 30u") DIMMs are required. The following table defines the possible memory configurations.

DIMM Configurations

Installing/Removing Memory

See "Installing System Board Options" in the online System User's Guide.

Upper Memory Map

Conventional Memory Map

Flash Memory Implementation

The Intel� PA28FB200BX 2-Mb Flash component is organized as 256 K x 8 (256 KB). The Flash device is divided into 5 areas, as described in Table 1. If a 1-Mb Flash component is used, Table 2 describes the organization of the 128 K x 8 (128 KB) area.

The Flash device resides in system memory starting at E0000H and can be mapped 2 different ways depending on the mode of operation. In Normal mode, address line A16 is inverted, setting the E000H and F000H segments so that the BIOS is organized as shown in the "System Address" column in Table 2.

Recovery mode removes the inversion on address line A16, swapping the E000H and F000H segments so that the 16-KB boot block resides at FE000H where the microprocessor expects the bootstrap loader to exist. This mode is only necessary in the unlikely event that a BIOS upgrade procedure is interrupted, causing the BIOS area to be left in an unusable state. Although Table 2 shows only 128 KB of ROM space, the other segments are dynamically paged in and out at run time, into the 64-KB BIOS area in system memory.