TECHNICAL PROGRESS REPORT. PART I. HIGH-SPEED COMPUTER PROGRAM. PART II. ILLIAC II SYSTEM PROGRAMMING AND OPERATING. PART III. CIRCUIT RESEARCH PROGRAM. PART IV. MATHEMATICS. PART V. IBM 7090-1401 SYSTEM. PART VI. GENERAL LABORATORY INFORMATION
Work on the high-speed computer program involved component testing, construction and use of a switching time test rig for evaluation of 2N1072's and possible replacement types, modification and testing of the magnetic drum serial 129, modification of driver circuits to overcome power system noise generation, modification to the +65-volt distribution system and the sensing transformer of the core memory (splitting the +65-volt supply into x-y and sense amplifier sections showed the sense amplifiers to be the most sensitive), and design of the cabling arrangement for the 1401. For the ILLIAC II system, a doubleprecision decimal read routine for Pass 1 of the assembler was written; a subroutine for calculating log/sub 10/x, log/sub e/x, and log/sub 2/x was written, four library programs for the card operating system were checked out, the three basic passes of the card assembler were completed and checked, and all four tape units for the 1401 processing system were put into operation. Investigation of the experimental and theoretical aspects of the avalanche breakdown of transistors was initiated. Collector characteristics were examined by using very short pulses to eliminate thermal runaway. Tenative mechanisms were advanced to explain the observed I/sub c/ = /sub m/I/sub E/ + MI/sub co/ relation. The performance of the T-line system was studied with several 5 ma tunnel-diodes. An input/output impedance ratio of better than two with a voltage gain approaching one up to 1 kmc was achieved. These experiments show that tunnel diode systems using power amplifiers of high directivity and without reflection to the input can be built. A program for investigating the stability behavior of different amplifier types was written for the 7090. Measurements of flip flop performance were completed; experimental figures agreed well with phase-plane theory. A new Mersenne prime M/sub 9689/, having 2917 decimal digits, was discovered by ILLIAC II. Two new routines; Floating Point Factorial (FORTRAN, MAD, SCAT) and FORTRAN Axes and Point Plotter; were added to the 7090 library. Forty-two research problems, specifications of which were submitted for IBM 7090 programming, are described, and IBM 1401 and IBM 7090 use is summarized. (D.C.W)
- Research Organization:
- Illinois. Univ., Urbana. Digital Computer Lab.
- DOE Contract Number:
- AT(11-1)-415
- NSA Number:
- NSA-17-023851
- OSTI ID:
- 4708530
- Report Number(s):
- TID-18629
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- United States
- Language:
- English
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TECHNICAL PROGRESS REPORT. PART I. HIGH-SPEED COMPUTER PROGRAM. PART II. ILLIAC II SYSTEM PROGRAMMING AND OPERATION. PART III. CIRCUIT RESEARCH PROGRAM. PART IV. SWITCHING THEORY. PART V. DATA REDUCTION METHODS. PART VI. IBM 7090-1401 SYSTEM. PART VII. GENERAL LABORATORY INFORMATION
TECHNICAL PROGRESS REPORT. PART I. HIGH-SPEED COMPUTER PROGRAM. PART II. ILLIAC II SYSTEM PRROGRAMMING AND OPERATION. PART III. CIRCUIT RESEARCH PROGRAM. PART IV. IBM 7094-1401 SYSTEM. PART V. GENERAL LABORATORY INFORMATION