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These registers include both user and executive copies of the A, X, R, and J registers and many special function executive registers. The table on the right shows the addresses in octal of the user registers.
There are 15 index registers X X1516 accumulators A A15and 15 special function user registers R The 4 J registers and 3 "staging registers" are uses of some of the special function R registers.
One interesting feature is that the last four index registers X X15 and the first four accumulators A A3 overlap, allowing data to be interpreted either way in these registers.
These machines had different architectures and word sizes and were not compatible with each other or with the and its successors. They all used vacuum tubes and many used The univac 1107 memory as their main memory. It was never sold commercially. This was the first commercial computer to use core memory instead of the Williams tube.
The first computer I ever used was a UNIVAC , and for more than a decade stretching from through , most of my programming was oriented toward those machines, spanning four generations of hardware: the , , , and /80 (which I used briefly to develop microprocessor software). UNIVAC (Universal Automatic Computer) is a line of electronic digital stored-program computers starting with the products of the Eckert–Mauchly Computer Corporation. Later the name was applied to a division of the Remington Rand company and successor organizations. The was introduced in Integrated circuits replaced the thin film memory that the UNIVAC used for register storage. Smaller and faster cores, compared to the , were used for main memory. In addition to faster components, two significant design improvements were incorporated: base registers and additional hardware .
They all used transistorized electronics and integrated circuits. Early machines used core memory the used plated wire memory until that was replaced with semiconductor The univac 1107 in It was also known as the Thin-Film Computer because of its use of thin-film memory for its register storage.
It represented a marked change of architecture: The machine's registers were stored in words of thin-film memorya faster form of magnetic storage. With six cycles of thin-film memory per 4 microsecond main memory cycle, address indexing was performed without a cycle time penalty.
Only 36 systems were sold. The core memory was available in 16, bit words in a single bank; or in increments of 16, words to a maximum of 65, words in two separately accessed banks.
With a cycle time of 4 microseconds, the effective cycle time was 2 microseconds when instruction and data accesses overlapped in two banks. The word thin-film memory general register stack 16 each arithmetic, index, and repeat with a few in common had a nanosecond access time with a complete cycle time of nanoseconds.
Six cycles of thin-film memory per core memory cycle and fast adder circuitry permitted memory address indexing within the current instruction core memory cycle and also modification of the index value the signed upper 18 bits were added to the lower 18 bits in the specified index register 16 were available.
Programs could not be executed from unused thin-film memory locations. The FH drum memory unit was also supported as a spooling and file-storage media. Spinning at RPM, it stored approximatelybit words.
Thewithout any peripherals, weighed about 5, pounds 2. Smaller and faster corescompared to thewere used for main memory. In addition to faster components, two significant design improvements were incorporated: The two bit base registers one for instruction storage and one for data storage permitted dynamic relocation: To support multiprogramming, the had memory protection using two base and limit registers, with word resolution.
One was called the I-bank or instruction bank, and the other the D-bank or data bank. Guard Mode prevented user programs from execution of Executive Only "privileged" instructions, and from accessing memory locations outside the program's allocated memory.
The CPU was, with the exception of the word octal ICR Integrated Control Register stack, entirely implemented via discrete component logic cards, each with a pin high density connector, which interfaced to a machine wire wrapped backplane. The ICR Integrated Control Register stack was implemented with "new" integrated circuit technology, replacing the thin film registers on the The ICR consisted of bits, with a half-word Parity Bit calculated and checked with each access.
The core memory was contained in a one or more separate cabinet sand consisted of two separate 32K modules, for a total capacity of 64K bit words bits data and a Parity Bit for each bit half-word.UNIVAC (Universal Automatic Computer) is a line of electronic digital stored-program computers starting with the products of the Eckert–Mauchly Computer Corporation.
Later the name was applied to a division of the Remington . univac UNIVAC Thin Film Memory Computer MANUFACTURER Sperry Rand Corporation Remington Rand Univac Division Photo by Remington Rand Univac Division, Sperry Rand Corporation APPLICATIONS Manufacturer Basically, the UNIVAC is an advanced solid state data processing system designed and developed to provide .
The Univac seems have had about words of memory? Interesting Fact: in a presidential election, the Univac was able to predict who would win the race, Eisenhower in this case.
UNIVAC was the first computer made in the United States of America. This Week in Tech History: Univac Computer On this edition of "This Week in Tech History", Chris reminds us of the introduction of the Univac , a single computer, that took up an entire room. 1. INTRODUCTION Figure The Flying Head Magnetic Drum Unit The Flying Head (FH)magnetic drum is a large capacity, random-access data storage de.
– Sperry Rand Corporation of St. Paul, MN unveiled a new computer, known as Univac The electronic wizard employed what was known as thin-film memory. – Apollo 17, the last Apollo moon mission, is launched.