Hardware Functional Overview 3-7
ROM Memory
The NEC Versa 550 notebooks contains both the main system BIOS and the VGA BIOS
with Shadow BIOS capability.
I/O SUBSYSTEM
The I/O Subsystem of the notebook is implemented on the Motherboard using the UMC
82C863F chipset. The supported I/O interfaces on the notebook includes the internal hard
disk drive interface, the internal floppy disk drive interface, the external printer port inter-
face, the external serial port, and the external PS/2 keyboard and mouse port.
Features summary of the UMC 82C863F:
n
Compatible with IBM AT architecture
n
Supports up to two 360K, 720K, 1.2M, or 1.44MB floppy disk drives
n
Supports IBM PC/AT interface to IDE (Intelligent Drive Electronics)-type Win-
chester drives
n
Hardware or software configuration
n
Address decoding and strobe generator for game port
n
Supports two serial port functions
n
Supports one bi-directional IBM PS/2 compatible parallel port function
n
All functions can be enabled or disabled individually
n
Configuration Register can be easily selected
n
Only one 24MHz crystal needed
n
100-pin plastic flat package
VIDEO SUBSYSTEM
The video subsystem, implemented on the Motherboard and on the LCD Panel, controls the
display output to both the LCD Panel screen and also to the external VGA port.
The video subsystem utilizes the C&T 65545 High Performance Flat Panel / CRT VGA
Controller. It also includes 512KB (1MB for NEC Versa 550D1/550D) DRAM memory,
32-bit DRAM bus, and separate display and memory clocks. An additional frame
buffer/accelerator DRAM increases the available memory bandwidth for CPU accesses.
Summary of Contents for VERSA 500D WINDOWS 98 - UPGRADE INFORMATION
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