HP-45 With Shielding?

[JohnRausch]

It is an early one, 1301A 07574. The circuit board is quite a bit different that others I have or have seen, on the side opposite the shielding. The contact does go to ground. I'm not sure the shield around the display makes contact with anything, but will check if anyone is curious. Right now the calculator is in pieces. Unbelievably dirty.

(03-21-2020 01:15 AM)Raymond Del Tondo Wrote:  Yes, I had some of those with metal shielding.
Maybe the ceramic body of some of the ICs on the CPU boards
in the earlier units caused more radio interference than the later versions.