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Standard RAM was 1 MB and the video card was the same as in the PC 10 and 20. It had one 1.2 MB HD 5.25-inch drive and a 20 MB hard drive. The cabinet had a key lock switch added Notes: The "PC AT" is a "PC 40" with a "AT" added to the name. Commodore PC AT. The "PC AT" is a "PC 40" with a "AT" added to the name. Commodore PC 40-40
When the scratchpad is a hidden portion of the main memory then it is sometimes referred to as bump storage. In some systems [a] it can be considered similar to the L1 cache in that it is the next closest memory to the ALU after the processor registers, with explicit instructions to move data to and from main memory, often using DMA-based data ...
A RAM drive (also called a RAM disk) is a block of random-access memory (primary storage or volatile memory) that a computer's software is treating as if the memory were a disk drive (secondary storage). RAM drives provide high-performance temporary storage for demanding tasks and protect non-volatile storage devices from wearing down, since ...
The next eleven most significant bits (bits 52 through 62) are reserved for operating system use by both Intel and AMD's architecture specifications. Thus, from 64 bits in the page table entry, 12 low-order and 12 high-order bits have other uses, leaving 40 bits (bits 12 though 51) for the physical page number.
Texas Memory Systems, Inc. (TMS) was an American corporation that designed and manufactured solid-state disks (SSDs) and digital signal processors (DSPs). TMS was founded in 1978 and that same year introduced their first solid-state drive, [4] followed by their first digital signal processor.
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The price and speed of RAM and external storage have plummeted due to Moore's Law and improved RAM interfaces such as DDR3, thus reducing the need for virtual memory compression, while multi-core processors, server farms, and mobile technology together with the advent of flash based systems make virtual memory compression more attractive.
The IBM 3310, described as having "a storage capacity of 64.5 million characters", was to be used with "Storage disks .. sealed to reduce the possibility of damage, loss, misuse or contamination". The IBM 3370 with up to 571 million characters could also be used with an IBM 4341.