Oct. 30, 1978

arthur_schawlow_1978.10.30.jpg

  ARTHEUR L. SCHAWLOW
J.G. Jackson - C.J. Wood
  Professor of Phyiscs
      (415) 407-4358

                                                            October 30, 1978

              Mr. J. Torzewski
              51625 Chestnut Road
              Granger, IN 46530

              Dear Mr. Torzewski:

                   I am enclosing the instructions for converting an Apple I
              to 20K memory.  I am still not convinced that it is worth the
              trouble, but it does work.  We reconverted ours to check the
              instructions.

                   I really don't know whether the speed of the memory chips
              is critical.  I don't know anything about the chips we have
              used, and they may have been fast ones made surplus for some
              other reason, but we did not pay a premium for speed.  Still,
              bad chips can be very troublesome, and so you should try to
              get good ones if you can.

                   Do you have any information about input and output port
              circuits for the Apple I?  Even with the primitive BASIC, it
              could make a useful controller if it could be interfaced with
              transducers or relays.

                   I will be interested to hear how you make out if you do
              try the memory conversion.

                                        Yous sincerely,

Arthur L. Schawlow