As I recall, there was a variation of the 7D20 that was called
the 7D20T, that fit in its own chassis, and was used in conjunction
with computers to gather data.
A picture is shown on page 338 of the 1984 TEK Products catalog.
-Chuck Harris
Richard Steedman wrote:
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I have a 7D20 with a couple of modifications or options added. Can anyone provide some information about these?
The first is a board sitting on top of board A11 above the vacant IC sockets U1230, U1330 and U1430. It has a connector P200, connected to J100 on the CCD board A5. It has three ICs - a dual 4-input NOR gate, a quad analog switch/mux and a dual op-amp. One of the 7D20 photos on Barry Johnson's website looks like it has the same mod [()]().
The second is a small board sitting behind the front panel in-between boards A6 and A7. It's connector has flying leads soldered directly to pins of the CCD chips on the underside of board A5.
I have posted photos [here](/g/TekScopes/album?id=253175).
The 7D20 has a serial number in the B085000's and is running firmware F1.03. Any insights gratefully appreciated!
