Chapter 4 - Theory of Operation of the
GXTRA
Card
4-3
should be transparent (ie. allow the 8 color planes to be
displayed).
4.4 The FORTH PROM
The on-board PROM contains the FORTH code (Fcode) which
initializes the
GXTRA
card. This is a flash-programmable device,
which should not be adjusted in any fashion.
4.5 Timing Parameters
The following tables provide the timing parameters for the
GXTRA
card.
Table 4-1A Switch 1 - 640 x 480 @ 60 Hz Timing Parameters
PARAMETER
VALUE
UNIT
Horizontal Resolution
640
Pixel
Vertical Resolution
480
Pixel
Vertical Frequency
60
Hz
Horizontal Front Porch
0.607
usec
Horizontal Sync Width
3.943
usec
Horizontal Back Porch
3.033
usec
Horizontal Frequency
31.45
Khz
Vertical Front Porch
318.5
usec
Vertical Sync Width
63.7
usec
Vertical Back Porch
1083.0
usec
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