NEC LC1400, Service & Reference Manual

Page: 28 / 243

1-12 System Overview
SCSI Controller
The system board includes a Symbios Logic SYM53C875 embedded single channel
PCI SCSI controller. The controller is capable of operations using either 8- or 16-bit
SCSI providing 10 MB/s (Fast-10) or 20 MB/s (Fast-20) throughput, or 20 MB/s (Ultra)
or 40 MB/s (Ultra-wide) throughput. As implemented on the system board, the
controller attaches to an Ultra-2 SCSI backplane that supports up to seven Ultra-2 SCA
drives.
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.