On-Board Memory; Dram; Flash Bios; Non-Volatile Sram Or Doc2000 (Optional) - Xycom CHIP4e+ User Manual

CHIP4e+ Manual

On-board Memory

DRAM

The CHIP4e+ has one 72-pin SIMM memory site, providing up to 64 Mbytes of
DRAM. Populate the memory site with standard fast page mode memory or extended
data out memory (EDO). EDO memory improves DRAM read performance.

Flash BIOS

The CHIP4e+ board provides a Flash BIOS location for system and video ROM.
Table 0-1 describes the Flash memory map.
Device Address
60000-7FFFFh
10000-5FFFFh
00000-0FFFFh

Non-Volatile SRAM or DOC2000 (optional)

Socket U25 is a 32-pin ROM site that provides an option for installing non-volatile
SRAM or DiskonChip 2000 modules. You must specify which option you are
installing on the BIOS Setup Advanced menu (refer to Chapter 3 for more
information on the BIOS Setup menus).
You may only install SRAM or DOC2000 in socket U25; you cannot
install both.
Non-volatile SRAM contains a built-in battery and battery backup circuitry. Battery
life is approximately seven years in the absence of VCC. Socket U25 supports
32Kx8 and 128Kx8 memory sizes. BIOS defines the location of SRAM as CC000.
DiskOnChip 2000 (DOC2000) is a Flash memory module. It contains an expansion
BIOS that allows Flash memory to emulate a disk drive when the corresponding
option is enabled in the BIOS Setup Advanced menu. If the system already
incorporates a C: drive (IDE), DOC2000 becomes the D: drive. When installed, the
DOC2000 module occupies memory address CC000-CFFFFh.
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Table 0-1. Flash Memory Map
Software System Address
System BIOS E0000-FFFFFh (also FFFE0000-
FFFFFFFFh)
Undefined
Video BIOS C0000-CFFFFh
Note