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3-2 Hardware Functional Overview
FUNCTIONAL BLOCK DIAGRAM
The following figure shows the NEC Versa 2500 Series functional diagram.
Bank 0
8MB
(on-board)
Bank 1
8, 16MB
(DIMM)
Cache RAM
L2: 256 KB
write back
CORE CHIP
UMC
UM8891BF-N,
UM8892BF-N,
UM8886BF-N
VGA CHIP
C&T 65548
CRT ON
LLM
INVERTER
FLASH BIOS
256KB
PCMCIA
OMEGA
82C094
KB
CONTROLLER
MITSUBISHI
M38813M4
SUPER I/O
NS PC87336VLJ
GLIDE PAD
EXT. KB/MOUSE
INTERNAL KB
CARD 1
CARD 0
FDD
HDD
PRINTER
CLOCK GEN
ICS
AV9154-43
AC or DC
ADAPTER
DC/DC
CONVERTER
24MHz14.318MHz X'TAL
BATTERY IN
VIDEO RAM
1MB
COM1
Battery IN
+3.45V
+5V
+12V
66MHz
14.318MHz
Pentium
P54CSLM-
133MHz
Figure 3-1 Functional Block Diagram
SYSTEM BIOS
The primary function of the system BIOS (Basic Input-Output System) is to provide a se-
ries of software interrupts, functions, and sub-functions that control operations on certain
devices, such as the hard disk drive, the floppy drive, and the video subsystem.
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