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Test Your Knowledge in Computers #747
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The Z80 uses 248 out of the available 256 codes as single byte opcodes.
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xvportnotify(3) [opensolaris man page]

XvPortNotify(3)                                                   libXv Functions                                                  XvPortNotify(3)

XvPortNotify - event generated when port attributes change SYNOPSIS
#include <X11/extensions/Xvlib.h> typedef union { int type; XvVideoNotifyEvent xvvideo; XvPortNotifyEvent xvport; long pad[24]; } XvEvent; typedef struct { int type; unsigned long serial; Bool send_event; Display *display; XvPortID port_id; Time time; Atom attribute; long value; } XvPortNotifyEvent; type Specifies the type of event: XvPortNotify. serial Number of the last request processed by the server. send_event True if the event was generated by a SendEvent request. display A pointer to the display the event was read from. port_id The port whose attribute has changed. attribute An atom specifying the attribute that changed. value The new value of the attribute. DESCRIPTION
XvPortNotify events are generated when a port attribute is set using the XvSetPortAttribute(3) function. SEE ALSO
XvSetPortAttribute(3), XvGetPortAttribute(3), XvSelectPortNotify(3). X Version 11 libXv 1.0.7 XvPortNotify(3)

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