A USB adapter for a vintage Depraz mouse #VintageComputing
Produced in the early 1980s, The stylish Depraz mouse was used in several systems, the most interesting being the Blit and its descendants, the DMD 5620 and others.
John Floren acquired one from Ron Minnich. The mouse was ex-Bell Labs, previously in the ownership of the late Jim McKie. John had always wanted to try using one…
The mouse has a male DE-9 connector. This might make you assume it speaks the same serial mouse protocol we all knew and loved back in the 90s, but you’d be wrong–and the first hint should have been that it’s a male connector, when all those serial mice had female connectors.
I had to post on the TUHS mailing list for help, but I was quickly pointed at this page, which informed me that the mouse is one of those old-fashioned types which directly expose the outputs of their quadrature encoders over the connector. The pinout is:
Pin 1: +5V
Pin 2: Y1 encoder
Pin 3: Y2 encoder
Pin 4: X1 encoder
Pin 5: X2 encoder
Pin 6: GND
Pin 7: Middle mouse button
Pin 8: Right mouse button
Pin 9: Left mouse button
Using a DE-9 breakout adapter, I wired the mouse to an Arduino Pro Micro.
See the video below and full details in the article here. There is bonus info on how the mouse was weighted also.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.