Write-only memory (WOM), the other of learn-solely Memory Wave focus enhancer (ROM), started as a humorous reference to a memory machine that could possibly be written to however not learn, as there appeared to be no sensible use for a memory circuit from which data couldn't be retrieved. Nevertheless, it was finally recognized that write-only memory also describes sure functionalities in microprocessor methods. The concept remains to be often used as a joke or euphemism for a failed memory system. 1940s. Considered "an icebreaker", it was intentionally included within the Signetics catalog. As an alternative of the extra standard characteristic curves, the 25120 "absolutely encoded, 9046×N, Random Access, write-only-memory" information sheet included meaningless diagrams of "bit capacity vs. Temp.", "Iff vs. Vff", "Number of pins remaining vs. variety of socket insertions", and "AQL vs. selling value". 10 Vcc (double the Vcc of normal TTL logic of the day), and Vdd of 0±2% volt (i.e. floor). It was specified to run between 0 and −70 °C.

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