Thin film memory
Thin Film Memory , developed by Sperry Rand in 1961 during a US- funded research project, is a faster variation on core memory technology .
Instead of ferrite , a thin film with a layer thickness of approx. 1.016 · 10 −7 m of an alloy made of iron - nickel , also called permalloy , was vapor-deposited onto a glass plate by means of vacuum evaporation. This process created a pattern of dots on the glass plate. The conductive connections were then printed on by means of printed circuit boards. Compared to core memory, this type of memory had extremely fast access times in the region of 670 ns, but it was very expensive to manufacture.
Thin film memory was mainly used in the military sector and in a few computers such as the UNIVAC 1107 also in the civil sector. Also in the IBM - S / 360 -line thin film was used. With the innovations in core memory, thin-film technology became obsolete.