Section 1 Processors with one address per instruction 91
The SDS 910-9300 series
The SDS 910-9300 computers are illustrative of typical, second-generation 24-bit computers. The computers are discussed in Part 6, Sec. 2, page 542. Chapter 42 also attempts to show how implementation affects performance for the series.
The LGP-30 and LGP-21
The LGP-30 and later LGP-21 is presented in Chap. 16 and discussed in Part 3, Sec. 2, page 216.
IBM 650 instruction logic
The IBM 650 (Chap. 17) is a one plus one address computer. Its attributes as a cyclic-memory computer, though hardly apparent at the ISP level, are discussed in Part 3, Sec. 2, page 216.
The IBM 7094 I, II
Part 6, Sec. 1 shows the evolution of the IBM 36-bit scientific computers. The IBM 7094 II (Chap. 41) is presented for many reasons (page 517). Among them are its effect on the later IBM System/360 and its position as the standard large scientific computer of the late fifties and early sixties.
The UNIVAC system
The UNIVAC system, first delivered in March, 1951, was later known as UNIVAC I. UNIVAC (UNIVersal Automatic Computers) was the second computer1 to be manufactured by the Eckert Mauchly Computer Corporation, subsequently a division of Remington-Rand.2
UNIVAC is a single-address, decimal computer with 12 digits/ word. Two instructions are stored per word. In effect, UNIVAC is a decimal version of the IAS computer. The Mp consists of 1,000 words, made up of 10 words/delay line. Each delay line requires 404 microseconds to recirculate.
UNIVAC is significant because it was the most important computer during the early 1950s. Its performance record is discussed in Chap. 8. The UNIVSERVO magnetic-tape system was rather advanced for 1950, considering performance, error checking, and buffering. Particularly nice is the ability to partition the input/output system for off-line printing and key punching.
One-level storage system
The 48-bit Atlas was developed at Manchester University and subsequently manufactured by Ferranti Corp. (now part of International Computers and Tabulators). The development began about 1960, and the paper was written in 1962. The importance of Atlas with respect to current and future machines is discussed in Part 3, Sec. 6, page 274.
The engineering design of the Stretch computer
The IBM Stretch (also called the IBM Model 7030) single-address computer (Chap. 34) is one of the earliest computers built to provide maximum computing power subject to no apparent cost, size, and producibility constraints. A discussion of its importance is given in Part 5, Sec. 2, page 396.
1The Eckert-Mauchly BINAC was apparently the first computer to be manufactured by a corporation.