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vintage Sharp QA-25 Computer Overhead Projection Panel - $40 (Midtown West)
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*** CONDITION: POWERS ON AND CAN ADJUST SCREEN CONTRAST BUT I HAVE NEVER TESTED / USED WITH A COMPUTER -- COMES ONLY WITH UNIT AND POWER SUPPY ***
The Sharp QA-25 Computer Projection Panel is a display medium for the presentation of a computer screen via overhead projector. With the Sharp QA-25, the Computer Projection Panel incorporates monochrome LCD and is placed directly on an overhead projector glass platen. The panel is connected to separate RGB video signal from a personal computer that is equipped with IBM PC CGA / DB 9-pin or other appropriate RGB adapter. This system allows projection of the computer's display via overhead projector without any software modifications.
user guide / manual: https://www.usersmanualguide.com/manuals/sharp/QA25_OM_GB.pdf