(2048x8 bit Core Memory)
The Early Computer Memory
Since the ENIAC -- the first computer to be used commercially, went into service in 1945, there have been only three major memory formats.
In 1945, the ENIAC computer used thousends of vacuum tubes and had a memory of mercury and nickel wire delay lines. Between 1945 and 1954, delay lines, William tubes and magnetic drums was used as memory devices.
In 1952 at MIT, Jay Forrester invented the Core Memory. A core was a small ring of ferrite, a ferromagnetic ceramic material that could be magnetized in either of two directions. This unique feature of core enabled it to hold a bit of information, either a 1 or 0, depending on the direction of the magnetic charge. Core memory was used in about 95% of all computers by 1976.
In 1974, transistor (semiconductor) memory had become
economical and the move to this type of memory began . Transistors led to
integrated chips, wich led to today's very highly integrated technology.
The Birth Of The Semiconductors
In 1968 a small company called Intel was startet and it's
charter was to design, manufacture and market semiconductor memory
components incorperating large scale integrated (LSI) technology. The
company saw an untapped market in the replacement of computer core memories
by producing low-cost, standardized circuits in high volume. Initial efforts
were directed at bipolar and MOS memories.
Bipolar memories was not new, but Intel adopted an
innovation, Shottky bipolar technology.
Later in 1969 Intel also introduced the 1101, a 256-bit static RAM. This was the world's first high-volume MOS semiconductor memory, and the first use of MOS silicone gate technology.
Although the 1101 was too complex and too small to achive
broad market acceptans and not capable of penetrating the core market, its
basic MOS process was applied to shift registers (a simple form of serial
The introduction of the 1103, the worlds first 1K dynamic RAM, was a turning point in the history of integrated circuit: for the first time significant amount of information could be stored on a single chip. It began to replace core memories and became an industry standard. In 1972 it was the largest selling semiconductor in the world.
The 1103, by todays standards was a primitive device. It was slow, difficult
to make and test, and tuochy to operate. But it proved that semiconductor
memories were not only viable, but were a vast improvement over core
memories, and it greatly increased the power of computers as they then
The Future Of Computer Memory
A thought about the future of computer memory -- the first era lasted roughly 10 years, the second 20 years. We are now at 30 years of semiconductor memory. Whats next? Will Terabytes of information be stored in suger cube sized chrystals? Will neural networks contain trillions of molecules of bits?