NEC NEC Express5800 Series, Online Service Manual

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1-10 System Overview
Video Controller
The system has a high-performance SVGA subsystem that supports the following:
n BIOS compatibility with VGA, EGA, CGA, Hercules Graphics, and MDA
n
2 MB of Video Random Access Memory (VRAM) video buffer
n 16-bit bus for high-speed display memory access
n
Hardware accelerated bit block transfers (BITBLT)
n Display power management system
n
Supports 72Hz refresh, non-interlaced at: 640x480, 800x600, 1024x768, or 1280x1024 resolutions
n Displays of up to 16M colors at 640x480 and 800x600 resolutions, 64K colors at 1024x768
resolutions and 256 colors at 1280x1024 resolutions.
Peripheral Controller
The advanced integrated peripheral controller supports two serial ports, one parallel port, diskette
drive, PS/2-compatible keyboard and mouse, and integrated Real Time Clock (RTC). The system
provides the connector interface for each port.
Serial Ports
Both serial ports are relocatable. Each serial port can be set to one of four different COM ports and
can be enabled separately. When disabled, serial port interrupts are available to add-in boards.
Parallel Port
One IEEE 1284-compatible 25-pin bidirectional EPP (supporting levels 1.7 and 1.9) parallel port is
provided. BIOS programming enables the parallel port and determines the port address and
interrupt. When disabled, the interrupt is available to add-in boards.
External Device Connectors
The external I/O connectors provide support for a PS/2 compatible mouse and a keyboard,
connectors for VGA monitor, 2 serial port connectors, a parallel port connector and two USB
connections.