COMPUTER DIVISION
		  -----------------

		Service Bulletin No. 8
                ----------------------


To all Subsidiaries and distribution below

SUBJECT:  ROYAL MCBEE CORPORATION ELECTRONIC COMPUTER DEPARTMENT
          Machine Acceptance Test (For end record signals)
          Diagnostic No. 10
---------------------------------------------------------------

I.   FUNCTION:
     --------
     To test all tracks of memory for end recording symptoms.

II.  PROCEDURE:
     ---------
     The program first sets all locations to be tested to some
     non-zero number.  Then it shifts a set of standard instruc-
     tions to the last 1/2 of track zero ans R,U's to these
     instructions.  The instructions contain a clear order with
     bits between the order bits and the high order track bits.
     The testing procedure consists of modifying the address of
     this clear order (at the last optimum store-address time)
     and then executing it to make sure it is still a clear
     order.  If end records symptoms are present, this clear
     order will be changed to a hold and the program will detect
     this error.  If an error is detected the program will print
     out the track number on which the instructions are located.
     If there is no error, the instructions are moved to the
     last 1/2 of the next track and the process is repeated.

III. OPERATING PROCEDURE:
     -------------------
     1.  The tape is in hex. and contains check-sums.  It was
     meant to be loaded by prog. 10.4.

     2.  After the program loads a .0000600 is executed.  Depress
     start if break point 32 is not depressed.  The program will
     then set all locations to be tested to XZ0963, and then
     automatically proceed to check track zero as described under
     PROCEDURE.  If an error is detected the machine will print
     the track number which contains the testing instructions
     and stop (on break point 32).  If you wnat to recheck the
     same track, depress the TRANSFER CONTROL button and then
     start.  If the T-C button is up the program will proceed
     with the next track.

     3.  If a specific track is to be tested, follow the following
     procedure.
               a.  Depress MANUAL INPUT button on console
               b.  Type U0524 on the keyboard (Dec. loc. 0509)
               c.  Depress FILL INST. button on console
               d.  Depress ONE OP. button on console
               e.  Depress EXECUTE INST: button on console
               f.  Depress MANUAL INPUT button on console
(LF)
               g.  Type 00000XX on the keyboard, where
                   XX is the (hex.) track to be tested.
               h.  Go into NORMAL and START.


     4.  To keep testing the same track instead of proceeding
     sequentially, keep the T-C button depressed.

     5.  The computer will carriage return and print "end"
     after all tracks have been checked.

     6.  Location 0508 (dec.) contains the negative of the
     number of sectors that the clear order is modified by.
     It is set to -7 at q=29 in the hex. tape.  This makes
     the program run about 45 minutes.  The program can be
     speeded up by changing this to a smaller number i.e. to
     -13 or -14 at q=29, or it can be lengthened by changing
     it to a larger number i.e. -5 or -4.  This location must
     remain negative however.


IV.  STORAGE
     -------
     The program proper occupies the first 1/2 of tracks
     03,04,05, and 06.  The last half of every track will
     contain the testing instructions.  Every Nth. location
     is set to XZ0963 where -N is contained in location 0508.







PK/caw                                      P. KREBS
August 16, 1960


Distribution:  England, France, Germany, Italy, Switzerland,
               Mr. J.F. Ballard,
               Mr. R.L. Rankin,
               Mr. C.K. Krill,
               Mr. K. Lesemann,
               SHAPE, The Hague.