NEC LS2400, Руководство пользователя, Страница: 26 / 186

1-10 System Overview
SCSI Controller
The system board includes a Symbios Logic SYM53C875 embedded
dual-function, PCI SCSI host adapter. The SYM53C875 contains two
independent SCSI controllers that share a single PCI bus master
interface. Internally, each controller is identical, 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, controller A attaches
to a 68-pin 16-bit (wide) SCSI connector interface capable of supporting
a maximum of four 1-inch high SCSI Ultra-wide hard disk drives or
three 1.6-inch high SCSI Ultra-wide hard disk drives. Controller B
attaches to a 50-pin 8-bit (narrow) SCSI connector interface capable of
supporting three 5.25-inch removable media devices.
Video Controller
The system has a high-performance SVGA subsystem that supports the
following:
!
BIOS compatibility with VGA, EGA, CGA, Hercules Graphics, and
MDA
!
2 MB of Video Random Access Memory (VRAM) video buffer
!
16-bit bus for high-speed display memory access
!
Hardware accelerated bit block transfers (BITBLT)
!
Display power management system
!
Supports 72Hz refresh, non-interlaced at: 640x480, 800x600,
1024x768, or 1280x1024 resolutions
!
Displays of up to 16M colors at 640x480 and 800x600 resolutions,
64K colors at 1024x768 resolutions and 256 colors at 1280x1024
resolutions.