Write-only memory (WOM), the alternative of read-only memory (ROM), started as a humorous reference to a memory system that may very well be written to however not read, as there gave the impression to be no practical use for a memory circuit from which information couldn't be retrieved. Nevertheless, Memory Wave it was ultimately recognized that write-only memory additionally describes certain functionalities in microprocessor systems. The concept remains to be usually used as a joke or euphemism for a failed memory device. 1940s. Considered "an icebreaker", it was intentionally included within the Signetics catalog. As an alternative of the extra conventional characteristic curves, the 25120 "totally encoded, 9046×N, Random Entry, write-only-memory" data sheet included meaningless diagrams of "bit capability vs. Temp.", "Iff vs. Vff", "Number of pins remaining vs. variety of socket insertions", Memory Wave and "AQL vs. promoting worth". 10 Vcc (double the Vcc of customary TTL logic of the day), and Vdd of 0±2% volt (i.e. ground). It was specified to run between 0 and −70 °C.

The ultimate resting place of all data