Frame Buffer Organazation; Frame Buffer Selection; Electrical Specifications - Tech Source GXTRA Series Hardware Installation

GXTRA Hardware Installation -September 11, 1997
Video Output Standard
Video Connector
SBus Connector
Size
Drawing Engine
RAMDAC
VideoRAM
PROM
Keyboard/Mouse SIO
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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RS-343 75 Ohm Impedance
DB-13-W3
96-pin Mini-Din
83.82mm x 146.7mm (3.3" x 5.8")
Weitek Power 9100
IBMRGB640
4 Megabytes
On board flash
Zilog 85C30 SCC
6-2