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[no subject]

In system 26.3, with microcode 618, on LISP Machine Two:
I'm getting random wedgings on cadr-2 when trying to write stuff to the
color screen.  I'm using a function (HOWIES-BITBLT, written long ago by
Howie Shrobe) that writes directly into the color screen's bit array.
Generally, it gets a random amount of the way through putting my diagram
on the screen, and then cadr-2 stops with the run light on, responding
to warm boots but not to the call button.  HOWIES-BITBLT lives in