Appendix C Functional Description C-15
The single buffer UPAgraphics card accelerates applications-like windowing, 2-D
graphics, imaging, and video. The DBZ UPAgraphics card adds double-buffering
capabilities and a Z-buffer for accelerating 3-D graphics and animation. The single
buffer graphics card uses a 75-MHz frame buffer clock and the DBZgraphics card
uses an 83-MHz clock.

C.1.7.1 Graphics Card Features

Features provided by the UPAgraphics card include:
■YCC-to-RGB color space conversion for faster video decompression
■Contrast stretch support for imaging
■Line doubling for interlaced video writes
■Consecutive block prefetch for smart frame buffer reads
■DDC2B monitor serial communication with EDID default resolution support in
the boot PROM
■3DRAM3 OpenGL stencil function (four planes) support
■New RAMDAC support
■Single-buffered high-resolution (2.5 Mpixels) supports the following screen
resolutions (DBZ graphics card only):
■1920 ×1360 landscape mode (HDTV)
■1280 ×2048 portrait mode (medical)
■Buffer B addressing for stateless (dumb frame buffer) and video accesses (DBZ
graphics card only)

C.1.7.2 Graphics Card Performance

The single-buffer and DBZ graphics cards have identical window system
performance characteristics, 2D graphics, and imaging and video applications.
The DBZ graphics card also provides additional performance for 3D graphics and
animation applications through double-buffer and Z-buffer support.
C.1.8 Peripherals
The following peripherals are supported by the system unit: CD-ROM drive,
diskettedrive, and hard drive as well as a listing other RMA storage devices that can
be installed as X-option listed later.