∂09-JUL-73  1926		MA,JAM
 Sure.
 
∂6-JUL-73  1525		network site AI
 HELLO BRUCE.  THE 10/50 VERSION OF MACLIST IS IN THE CURRENT
 SOURCE, UNDER AN CONDITIONAL ASSEMBLY FLAG "D10".  THE "D10DBG!"
 FLAG IS SOMEWHAT OF A KLUDEGE TO INFORM THE ASSEMBLER THAT YOU
 WANT TO LOAD IN A MIDASXXXX DDT WITH THE ASSEMBLED LISP.
 FOR A DEC VERSION OF MIDAS, THE SAME THING MORE OR LESS HOLDS,
 IN THAT A CONDITIONAL SASSEMBLY FLAG IN THE MIDAS SOURCE MAKES
 IT INTO AN INT XXXXX ITS VERSION, OR A DEC VERSION.
 ON THE SIM; DIRECTORY OF THE ML MACHNE, THERE IS A FILE
 MIDAS SAVXXX
 WHERE XXX IS SOME RANDOMNESS, WITH POSSIBLE ONE OF THE X'S BEING
 A SPACE.  THIS IS RUNNABLE AS A 1SEG JOB, AND WILL ASSEMBLE BOTH
 ITSELF AND LISP.  ON THE JW; DIRECTORY IS A FILE
 LISP SAVYYY
 (SAME COMMENTS ABOUT YYY).  THIS IS THE LATES T VERSION, AND
 SEEMS TO WORK WELL WITH ALL THAT I CAN TEST IT ON HERE - 
 OUR 10/50 SIMULATOR IS NOT QUITE UP TO SNUFF, AND I HAVENT BEEN ABLE
 TO TEST OUT THE I/O FOR DSK.  THE GUYS FROM WORCESTER HAVE JUST
 TAKEN THIS VERSION BACK TO THEIR PDP10 AND WILL CHECK IT OUT
 FURTHER.  IN THE MEANTIME, FEEL FREE TO TRY ANY OF THESE
 GOODIES [LISP SOURCE IS ON DIRECTORY LISP; OF BOTH MACHINES,
 BUT THE HIGHEST NUMBERED VERISION ON ML IS THE LATEST.  MIDAS
 SOURCE IS ON DIRECTORY SYSENG; OF AI, AND IS PROBABLY ABOUT
 VERSION 124 OR S.O.].  I WILL BE GONE FOR ABOUT TWO WEEKS
 TO VISIT MY PARENTS ETC,. AND HOPE TO HAVE COMPATIBLE
 INDEX, GRIND, COMPLR ETC. DUPEXXX DUMPED OUT BEFORE I LEAVE.
 THE POSSIBLE DISCREPANCY IS THAT WE ARE ON THE VERGE OF
 SWITCHING OUR FIXNUM STORAGE STRATEGY SO THAT OUR SUPERWINNING
 NUMBER COMPILER CAN WIN.  TESTS LOOK GOOD SO FAR, BUT 
 MANY PROGRAMS WILL HAVE TO BE RECOMPILED IN ORDER TO RUN
 UNDER THE NEW LISP.  I PLAN TO LEAVE IT IN SYS AS 
 TS NLISP WHILE I'M GONE, AND ENCOURAGE PEOPLE TO TRY IT.
 WITH A LITTLE CARE, A PROBRAM CAN BE WRITTEN AND COMPILED
 THAT WILL RUN OK UNDER BOTH LISP AND NLISP, BUT QUITE
 LIKELY, MOST OF THE BIG PROGRAMS WILL HAVE TO BE RECOMPILED
 (AND HORRORS, POSSIBLY RE-DEBUGGED IF THEY DEPENDED ON THE
 FIXNUM SOTORAGE STRAGTEGY).  ANYWAY, THE 10/50 STUFF IS
 IN NLISP SINCE THIS IS THE WAY OF THE FUTURE. 
 ROTS OF RUCK, AS THEY SAY, WILL BE IN TOUCH WIT H YOU IN A
 COUPLE OF WEEKS, WITH THE LATEST COMMENTS.