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The ISA system was developed by Seimart and Indesit, two (now defunct) Italian TV manufacturers, but i can't find any thechnical description on the web.
An interesting fatc: in the early years of Italian (b/w) television, from the mid 50s to the early 60s, some American manufacturers (Emerson, Philco, Admiral, Dumont, Raytheon, RCA) had TV manufacturing plants in Italy, their Italian sets were an interesting mix of Italian and American parts, styling and technologies.
For eample, 50s Admiral Italian-made sets were 100% identical to the US-built ones (the ones with the knobs in the top corners of the safety glass) but had Italian capacitors and tubes on their chassis
Philco used a 100% American made chassis but the CRT, the speaker and the cabinet were Italian (some even had push through bezels)
Raytheon sets were 100% Italian, Raytheon also set off a small diplomatic crisis between the US and Italy on alleged violations of the Treaty of Friendship when they decided to shut their Italian plant in Palermo in the late 60s and the mayor of Palermo tried to confiscate it
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