System Board - NEC POWERMATE 4100M Service Manual

System Board

The system boards are similar, differing only in the processor. The system board contains a
Flash ROM which is upgradeable through the BIOS Update utility (see Section 2).
Key features of the system board are listed below.
n
processor
Intel486SX™-33 – PowerMate 433D™
Intel486DX2™-66 – PowerMate 466D™
Intel486DX2-66 – PowerMate 466M™
Intel486DX4™-100 – PowerMate 4100M™
n
support for Intel OverDrive™ processor upgrades
n
4 megabytes (MB) of random access memory (RAM) in the SX an DX2 systems
and 8 MB in the DX4 systems
accepts 36-bit (32-bit U.S. and Canada), 70-nano second (ns) single-inline
memory modules (SIMMs)
expandable to 128 MB
n
8-kilobyte (KB) primary cache (16 KB in the Intel486DX4)
n
optional 256-KB secondary cache module
n
Wingine video graphics array (VGA) controller and 32-bit Local Bus
supports 640 x 480 with 16.8 million colors (24-bit true color), 800 x 600
with 64 K colors 1024 x 768 resolution with 256 colors, and 1280 x 1024
resolution with 16 colors
1-MB (two 256K x 16) video dynamic RAM (DRAM), expandable to 2 MB
128-KB (256K x 4) standard video cache, expandable 256-KB
n
two intelligent drive electronics (IDE) interface connectors
one fast local bus IDE connector (primary interface) used by the hard disk
drive to transfer data at the hard disk's optimum rate
one standard IDE connector (secondary interface) for additional IDE devices
(not used)
Technical Information 1-3