OK I found info on the system I was thinking of. The era was the same, but evidently not on 126's. I remember working on them in 116's and 107's I guess. Link to a pdf, really good article on them:
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=10&ved=0CHYQFjAJ&url=http%3A%2F%2Fuserweb.windwireless.net%2F~jimc%2Fchryaccfh%2Facc2servo.pdf&ei=1P31T8iqAcXJqgGh3_iJCQ&usg=AFQjCNHSyqC2PsFu16j_WaBtmUUsHOyvVQ

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