Sony GDM-2038 - Manual (Page 19)

Appendix
Sony Display Memory System
The GDM-2038 incorporates the Sony Display Memory
System (SDMS) that allows it to discriminate between the
types of input signals and to automatically display the
optimum picture.
The SDMS has a large-capacity non-volatile memory in
which the display conditions for each input signal is stored.
When the signal is input, the corresponding display
conditions are called back from the memory and the unit is
automatically adjusted for the signal.
It also has a video muting function. This function eliminates
display distortions that may occur when the input video
signal is changed.
Detailed explanation of the SDMS memory and the muting
function are given below.
The SDMS memory
There are two types of memory: factory-preset memory and
user memory.
Factory-preset memory
As explained in "Preset Mode” on page 10 optimum display
conditions for the 9 preset-type models (see the chart to the
right) are stored in the memory area at the factory. No
manual adjustment is necessary for these preset -type
models.
The contents in this memory area can neither be modified
nor erased by users. If you modify conditions while the
signals are input from a preset-type model, the newly set
conditions will be stored in the user memory area.
Priority is given to the modified conditions stored in the user
memory.
User memory
All the manual adjustments and modifications of an existing
condition you make are stored in this memory area.
They are stored together with the type of the input signal
and called back from the memory when the signal Is Input
again.
If you modify the condition already stored In the user
memory, only the corresponding values are changed.
The modified condition is not newly added to the memory.
VGA graphic
VGA text
VESA
VESA
VESA
1024x768
Macintosh II
Two page
8 1280 X1024
9 1280 X1024
The user can store
the conditions for
up to 15 unique
video signals or
change the existing
factory-preset
8 condition in this
9 memory area.
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15
The factory-preset
conditions are not modified
or erased by user input.
Upon reset of the system,
all the oontents of the user
memory are cleared, but
the factory-preset
conditions in this memory
area are not cleared.
If more than 15 conditions
are programmed into the
user memory area, the last
input condition will replace
the first user input.
The 16th entry moves
to 1st location in the
user memory.
Sony Display Memory System memory map
The video muting system
If the input video signal ohanges, the muting circuit senses
the change and mutes the screen. This function eliminates
scrambled images during the scanning transition.
Video frequency
or sync polarity —\
change
}
Muting
New video
/■—^ frequency or
1
sync polarity
On display Dark screen
□
On display
The muting duration differs depending on the time that takes
until the newly input signal is stabilized.
It will last a minimum of 1.5 seconds approximately.
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