Gefen GTB-HD-SIGGEN - Manual (Page 69)

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HD PATTERN SIGNAL GENERATOR SOFTWARE
5. Click the CHECKSUM button to generate the EDID checksum.
By default, the checksum will be restricted to the lower 4 digits. This feature
can be disabled unchecking the Show lower 4 digits of checksum only box.
y
In the example above, if the checksum were calculated by disabling the
Show lower 4 digits of checksum only
feature, the result would be 0x33600.
y
Uncheck to disable
truncation of checksum