Input or output devices {memory, computer} store data on magnetic disk {tanking} or in semiconductor memory {scratch pad memory}. Memories have byte sets. Memory-control devices assign addresses to bytes and read, write, sense, or inhibit bits.
Temporary memories {cache, memory}| can hold data.
Memories {holographic memory} can use interference patterns to store information and coherent input to retrieve information.
At surface positions, current can change magnetized-bubble direction {magnetic bubble memory}.
Magnetic cores can be registers {magnetic core memory}. Wire circles carry current to make solenoids with magnetism. Wires through magnetic cores can turn current off or on. Other wires through magnetic cores can read whether magnetism is present or not.
Memory controllers can read or write disks {random-access memory} (RAM) at any register location at all times. System stores information at random locations. For strings, logically add bits to make unique random numbers. Place string in memory at random-number position. Add line to table {hash table} relating memory-location random numbers to strings. To recover string from memory, look up random number in table. At that location, retrieve string from memory. Logically subtract bits from string.
Tapes {serial memory} read and write in sequence.
Disk or tape magnetic films {thin-film memory} can magnetize or not at all positions.
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Date Modified: 2022.0225