My "new" Tek 485 with opt 4

Reginald Beardsley

I just got a nicely refurbished 485 which lists "opt4" under the SN. I could find no information despite several searches. I was surprised at how little information there was at the My 465 manual says opt 4 is EMI environmental. Is that true of the 485 also?

It came with a CD of the service manual, but I'd like to get a nice hard copy original if anyone has one they are willing to part with. I can offer a 465 and RM45 manuals in good condition in exchange.

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