Planar PDP 43P - Manual (Page 27)

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En
English
Operations
Operations
4 PARTIAL (*Supported only on PDP-50 P)
The PARTIAL setting is available only during personal
computer input (1280 x 1024/60 Hz only).
The input signal and the screen maintain a dot to line ratio
of 1:1. Display is highly faithful to the source. However, in
order to maintain the 1:1 ratio, a portion of the display will
not appear on the screen.