The most famous was of course the AMD AM2901, which undoubtable won the battle. Somewhat remarkable in 1976 considering 16-bit designs were now being released. At the same time there was a competition of 4-bit processors. Most of the processors were new designs, a few were single chip implementations of older mainframes (such as the TMS9900 and the Intersil 6100. The 1970’s was a rush to design new and innovative processors, faster, more features, and more bits. The AN/ALQ-136 is designed to prevent the Cobra from being successfully targeted by RADAR guided missiles, failure means a strong possibility that the helicopter gets hit, not something its crew would like to deal with. This is required to protect the digital components of the system from electronic interference, whether from external sources, or from the helicopters own RADAR systems. It is built on a ceramic substrate with gold traces, and sealed in a metal package.
The single package contains almost 100 dies, and many discrete components. The ITT hybrid integrates 4 AMD AM2901B processor dies, as well as associated memory and interfacing elements. In this case the very versatile AMD 2901 was used. In 1982 a fast custom processor needed to be built with bit-slice elements. However in the early 80’s (the AN/ALQ-136 debuted in 1982) DSP processors were in their infancy. Today a modern DSP processor could handle this task without issue. This requires relatively fast processing, and a generally custom design. These boards are used to detect hostile pulse RADAR systems, analyze them, and begin jamming based on what type they are.
BIT SLICER FOR PC MOD
Two of these hybrids are used in the system, one for the Mod Recovery board, and one for the SLO processor board. It was designed and used for the AN/ALQ-136(V)1 CMS (CounterMeasures System) for the AH-1F Cobra Attack helicopter. A great example is this ITT hybrid processor. Military computing applications require many custom designs, as they are very mission specific. The 2901B’s are the 4 larger dies in a row, middle right.
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