BootX will sometimes set the stdout variable to null and then subsequently call io-emit which can eventually result in an infinite loop.

Index: forth/admin/iocontrol.fs

===================================================================

--- forth/admin/iocontrol.fs (revision 1041)

+++ forth/admin/iocontrol.fs (working copy)

@@ -80,6 +80,7 @@

 ;

 

 : io-emit ( char -- )

+  stdout @ 0= if drop exit then \ make sure stdout pointer is not null

   io-out-char c!

   io-out-char 1 " write" stdout @ $call-method drop

 ;