Graphics Accelerator; Video Memory; Plug And Play; Isa Bus - NEC POWERMATE P - SERVICE MANUAL 1995 Service And Reference Manual

Graphics Accelerator

The graphics accelerator is specifically designed for graphics-intensive operations, text and
color pixel amplification, and scrolling. The graphics accelerator provides 64-bit, ultra-high
performance for demanding True Color, High Color, and pseudocolor GUI and CAD
applications.
The accelerator minimizes bus traffic by off-loading the tasks normally performed by the
processor. The dedicated bit-block transfers (BitBLT) engine maximizes performance by
speeding the movement of large blocks of image data in video memory.

Video Memory

The system comes with 2 MB of on-board video DRAM. The video DRAM consists of four
256 KB by 16 chips on the system board. The 2 MB of video DRAM supports the
following resolutions, colors, and refresh rates:
n
1600 by 1200 pixels, 256 colors, 48.5 Hz (interlaced)
n
1280 by 1024 pixels, 64K colors, 48.5 Hz (interlaced), 60 Hz, 72 Hz, and 75 Hz
n
1024 by 768 pixels, 64K colors, 43 Hz (interlaced),60 Hz, 70 Hz, 72 Hz, and 75
Hz
n
800 by 600 pixels, 16.8 million colors, 60 Hz, 72 Hz, and 75 Hz.

Plug and Play

The system comes with a Plug and Play BIOS which supports Plug and Play technology.
Plug and Play eliminates complicated setup procedures for installing Plug and Play
expansion boards. With Plug and Play, adding a Plug and Play expansion board is done by
turning off the system, installing the board, and turning on the system. There are no jumpers
to set and no system resource conflicts to resolve. Plug and Play automatically configures
the board.

ISA Bus

The system board uses the ISA bus for transferring data between the processor and I/O
peripherals and expansion boards. The ISA bus supports 16-bit data transfers and typically
operates at 8 MHz. ISA expansion slot connector pin assignments are provided in Appendix
A.

PCI Local Bus

The 32-bit PCI-bus is the primary I/O bus for the system. The PCI-bus is a highly-integrated
I/O interface that offers the highest performance local bus available for the Pentium
processor. The bus supports burst modes that send large chunks of data across the bus,
allowing fast displays of high-resolution images.
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