This version of the microcode cannot be used with Edwin versions

This version of the microcode cannot be used with Edwin versions
before 3.39.

Improvements to X window event handling.  The purpose of these
improvements is to permit Scheme to read X events from the queue
without immediately performing their actions; this supports looking
ahead in the queue to find interrupt characters in Edwin.

* X-DISPLAY-PROCESS-EVENTS no longer does anything special for
  configure and exposure events that are received by xterm windows.
  New primitives XTERM-RECONFIGURE and XTERM-DUMP-RECTANGLE must be
  invoked by the Scheme event handler to get the same effect.  New
  event type `event_type_expose' is used to return exposure events.

* The coordinates and sizes returned in event objects are now in X
  pixel units.  New primitives XTERM-MAP-{X,Y}-{COORDINATE,SIZE} are
  used to translate these units into xterm character coordinates.