Vintage Tektronix 835 Programmable Data Communications Tester = Network Switches -A rotary button is missing

-A rotary button is missing

- The graphics card has video output but the image is flickering

Cycle count: 637

\n- username is root and no password

Vintage Tektronix 835 Programmable Data Communications Tester = Network Switches -A rotary button is missingTested for powers on only , Unit does power on as seen in pictures , red and green lights are on in the display. No further testing at all was performed to this item. AS IS, For parts only. UNTESTED : Not tested in any shape or form. Power cable adapter: has a power cable and other cables stored underneath item. No guarantee of any form of functionality. May be missing internal parts we are not aware of. No warranty No returns No exchanges No refunds.