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Click on any of the images below to begin the slideshow. You can pause it at any time using the PAUSE SLIDESHOW button at the bottom left of the picture. You can close the slideshow by using the CLOSE button at the bottom right of the picture.


 image of Front view of the Donner 3500 analog computer.  This rare analog computer was designed for engineers and teachers.  image of Front and top view of the Donner 3500 analog computer.  The wires (called patchcords) were used to program the computer; imagine substituting that wiring process for the modern keyboard.  image of View of the left side of the Donner 3500 analog computer -- notice the leather strap handles & angled front panel.    image of Right side view of the Donner 3500 analog computer -- patchcords have been removed.  image of Back of the Donner 3500 analog computer.  You can see the manufacturer's tag and some extra large holes to let the heat dissipate.  image of Closeup of the manufacturer's tag that includes the serial number.  You can also clearly see the company's name.  Later versions of this classic analog computer display the name Systron-Donner after the companies merged in 1960.  image of View of the back of the Donner 3500 analog computer which opened easily for access to cards and tubes.  The tubes of an analog computer generated quite a bit of heat.    image of Closeup of the opened back of the Donner 3500 analog computer.  Note voltage range of +/- 100 printed on the frame just above the tubes.  image of Closeup of the Donner 3500 analog computer patchboard from the top.  image of Closeup of the Donner 3500 analog computer's patchboard from the front.  This is the same section of the patchboard shown in the previous picture.  image of A view of the underside of the the Donner 3500 analog computer's patchboard.  You can also see the fan (covered by a screen) and the oblong openings that were used to dissipate the heat from the tubes.  image of Closeup of right side of the Donner 3500 analog computer control panel.  This rare portable analog computer was an important part of computer history.