Write-solely memory (WOM), the other of learn-only memory (ROM), started as a humorous reference to a Memory Wave Routine system that could be written to but not read, as there seemed to be no practical use for a memory circuit from which knowledge couldn’t be retrieved. Nevertheless, it was eventually recognized that write-solely Memory Wave also describes certain functionalities in microprocessor techniques. The idea continues to be usually used as a joke or euphemism for a failed memory gadget. 1940s. Thought-about “an icebreaker”, it was intentionally included in the Signetics catalog. Instead of the more conventional characteristic curves, the 25120 “absolutely encoded, 9046×N, Random Access, write-only-memory” knowledge sheet included meaningless diagrams of “bit capability vs. Temp.", “Iff vs. Vff”, “Number of pins remaining vs. variety of socket insertions”, and “AQL vs. selling worth”. 10 Vcc (double the Vcc of normal TTL logic of the day), and Vdd of 0±2% volt (i.e. ground). It was specified to run between 0 and −70 °C.

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