GXTRA
Hardware Installation -September 11, 1997
6-2
Video Output Standard
RS-343 75 Ohm Impedance
Video Connector
DB-13-W3
SBus Connector
96-pin Mini-Din
Size
83.82mm x 146.7mm (3.3" x 5.8")
Drawing Engine
Weitek Power 9100
RAMDAC
IBMRGB640
VideoRAM
4 Megabytes
PROM
On board flash
Keyboard/Mouse SIO
Zilog 85C30 SCC
6.3 Frame Buffer Organization
The
GXTRA/3
frame buffer is organized as 2 banks of video
memory. The first bank (Bank 0) addresses the 8-bit image
frame buffer. The second bank (Bank 1) addresses the 8-bit
overlay frame buffer.
6.3.1 Frame Buffer Selection
The frame buffers are selected by writing to the frame buffer
select port corresponding to the desired frame buffer. There are
two ports on the
GXTRA/3
which map the appropriate frame
buffer.
6.4 Electrical Specifications
The following table provides the electrical specifications for the
GXTRA/3
Turbo card.
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