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                  I ntcl'-()ffice I'v1enlorandu m

        To        DJyid Liddle                              Date          September 19. 1977


        From      Charles Simonyi                          location       Palo Alto


        SUbject   Progress Report                          Org:mization   SOD/SD


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        Filed on: (Simonyi)sddsep.memo



        Prototype Software (Charles Si monyi)

        Programming of the Diamond Recompilation, Service, and Test Modules has been-
        progressing well. The total size of these programs is now 29500 lines. All of the code has
        been converted to Mesa 3. The Recompilation Module is nearing completion. There were
        some difficulties in binding the Service l'w1odules. A minor simplification has been defined
        to solve these problems. The Test fvlodule is working well. but it still needs to be integrated
        with the Service Modules.

        The Tvlesa group has been briefed about the details of these activities. A demo of the Test
        Module was given as part of this briefing. It is hoped that improved communication about
        our problems and about our approaches to solving them will lead to increased coordination
        and cooperalion.

        A valuable opportunity was exploited by a two man-week study of the Mesa microcode to
        find out if Butler Lampson's original implementation ideas, which had the potential of
        doubling the current execution speed, can- be made to fit the available space. The original
        sketches were microcoded and a number of space-saving ideas were contributed. The results
        are not only that the fast microcode can be fitted. but also a fair amount (about 50-80 words
        out of lK) of microcode space will be left for future developments. These results- were
        handed over to Roy Levin of CSL for further optimization anel implementation. -\Vith the
        new microcode. Diamond will have the potentia) of outperforming Bravo even on the Alto.



        Copies to: Bergsteinsson, Heini-ich, Irby, Lynch, Metcalfe. Shultz, Szelong, Stottlemyre,-
        Townsend, vVeaver

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