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QWIN(DOW)/WIN(DOW)/DEF_WINDOW - Enquire and alter readout window

QWINDOW prints out what the current readout window is. WINDOW alters it.

Parameters

QWINDOW requires none. WINDOW requires four - (XSTART,YSTART) and (XSIZE,YSIZE) respectively. The co-ordinate system is that of the chip relative to (1,1) which is the light sensitive pixel at the corner from which it is read out (bottom right on Lexidata). (XSTART,YSTART) defines the bottom right hand corner of the read out data and (XSIZE,YSIZE) are its dimensions.

Examples

Adam:> WINDOW 1 1 385 576

Notes

Reading out part of the chip in this way is quicker and takes less space on the tape/disk, but only if the window is towards the lower numbered pixel corner.

Overscan can be achieved by making XSIZE or YSIZE such that the image exceeds the physical chip dimension.

The original WINDOW can be restored by issuing another WINDOW command with the full pixel dimensions of the chip, or alternatively, by typing CHIP or DEF_WINDOW

The windowed portion of the chip is displayed on the Lexidata screen in the position it would normally occupy on the whole chip display.