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* [[Diode matrix]] ROM, used in small amounts in many computers in the 1960s as well as electronic desk [[calculator]]s and keyboard encoders for [[computer terminal|terminals]]. This ROM was programmed by installing discrete semiconductor diodes at selected locations between a matrix of ''word line traces'' and ''bit line traces'' on a [[printed circuit board]].
* [[Resistor]], [[capacitor]], or [[transformer]] matrix ROM, used in many computers until the 1970s. Like diode matrix ROM, it was programmed by placing components at selected locations between a matrix of ''word lines'' and ''bit lines''. [[ENIAC]]'s Function Tables were resistor matrix ROM, programmed by manually setting rotary switches. Various models of the [[IBM]] [[System/360]] and complex peripheral devices stored their [[microcode]] in either capacitor (called ''BCROS'' for ''balanced capacitor read-only storage'' on the [[IBM System/360 Model 50|360/50]] and 360/65, or ''CCROS'' for ''card capacitor read-only storage'' on the [[IBM System/360 Model 30|360/30]]) or transformer (called ''TROS'' for ''[[transformer read-only storage]]'' on the [[IBM System/360 Model 30|360/20]], [[IBM System/360 Model 40|360/40]] and others) matrix ROM.
* [[Core rope memory|Core rope]], a form of transformer matrix ROM technology used where size and weight were critical. This was used in [[NASA]]/[[MIT]]'s [[Apollo Guidance Computer|Apollo Spacecraft Computers]], [[Digital Equipment Corporation|DEC]]'s [[PDP-8]] computers, the [[Hewlett-Packard 9100A]] calculator, and other places. This type of ROM was programmed by hand by weaving "word line wires" inside or outside of [[ferrite (magnet)|ferrite]] transformer cores.<ref>
*https://www.youtube.com/watch?v=ndvmFlg1WmE
*Science Reporter, [[MIT]], [[WGBH]]
*''Computer for Apollo'' (1965)
*hand-sewn Core rope ROM assembly
*discrete transistor RAM assembly
*"jacquard" wire-wrapped logic board assembly by machine
</ref>
* Diamond Ring stores, in which wires are threaded through a sequence of large ferrite rings that function only as sensing devices. These were used in [[TXE]] telephone exchanges.
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