Early (Buggy) HP-35 - Insides Message #1 Posted by Mark Henderson on 1 Feb 2010, 4:27 p.m.
I have just got an early HP-35 into my collection - one with "The Bug "- exhibits all the bugs documented here on MoHPC. It's a Type/Model 2 (dot on 5 key, "Hewlett Packard" without the 35, S/N is 1230A).
It has intermittent power switch and battery "switch" contacts, and since the label had already been damaged, I disassembled and cleaned it up a little.
Very interested to see some "tinplate" EMI shielding in the case bottom and around the display - I haven't seen this in other Classics (HP-45, HP-55) - was this the norm for this generation? Do other 35s have this (I have a Type/Model 4 but have not opened it yet)?
Looks just like tricks I've had to play on my own products to get through FCC, but this wasn't as much an issue in the 70s, or was it??
Cheers
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