Write-solely Memory Wave Protocol (WOM), the other of read-only memory (ROM), began as a humorous reference to a memory gadget that might be written to however not learn, as there gave the impression to be no practical use for a memory circuit from which knowledge could not be retrieved. Nevertheless, it was finally acknowledged that write-only memory additionally describes certain functionalities in microprocessor methods. The concept remains to be often used as a joke or euphemism for a failed memory system. 1940s. Thought-about "an icebreaker", it was intentionally included in the Signetics catalog. As a substitute of the extra conventional characteristic curves, the 25120 "absolutely encoded, 9046×N, Random Entry, write-solely-memory" knowledge sheet included meaningless diagrams of "bit capability vs. Temp.", "Iff vs. Vff", "Variety of pins remaining vs. number of socket insertions", and "AQL vs. selling value". 10 Vcc (double the Vcc of commonplace 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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