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In March 1955, 4096 words of magnetic-core memory were added to the system, replacing the earlier Selectrons. This required all 12 bits of addressing, and caused programs that stored data in the "spare bits" to fail. Later in 1955 a 12k-word drum memory secondary storage system was added as well.
It requires a minimum of 12K words of memory (8K for the operating system and 4K for the user swap area) and a swapping device; The standard swapping device, called a drum, was a disk drive with a head assigned to each track so there was no delay waiting for a read/write head to be repositioned on the drive.
The initial system consisted of three Data General Nova minicomputers with 12k words of memory, several VST 1200 terminals, a Tektronix 4002 graphics terminal, and an HP 7200 plotter. In September 1973 the CPUs were updated to 32k words of memory. [6]
If that memory is arranged in a byte-addressable flat address space using 8-bit bytes, then there are 65,536 (2 16) valid addresses, from 0 to 65,535, each denoting an independent 8 bits of memory. If instead it is arranged in a word-addressable flat address space using 32-bit words, then there are 16,384 (2 14) valid addresses, from 0 to ...
The 930 offers a "memory extension system" that allows addressing more than 16284 words. Two 3-bit "Extend Memory Registers", called EM2 and EM3, are provided which can be loaded with a value to be used as the high-order three bits of the effective address. Addresses 00000 8 –17777 8 (the first 8192 words of memory) are always unmodified. If ...
That day, memory expert Harry Lorayne appeared as a guest, and in mere minutes, memorized the last names of every one of the 50 or so kids in the studio audience. He advised us to choose one ...
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The word RAM model is an abstract machine similar to a random-access machine, but with finite memory and word-length. It works with words of size up to w bits, meaning it can store integers up to 2 w − 1 {\displaystyle 2^{w}-1} .