I believe that that is a joystick interface for an Apple ][. I think it allows you to attach both joysticks and knob style controllers and switch between them "on the fly". Bill S. -----Original Message----- From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Electronics Plus via cctalk Sent: Wednesday, May 15, 2019 2:22 PM To: 'General Discussion: On-Topic and Off-Topic Posts' Subject: What is this? https://cdn.discordapp.com/attachments/486774619186135050/578282338375565322 /JPEG_20190515_130651.jpg <https://cdn.discordapp.com/attachments/486774619186135050/578282338375565322/JPEG_20190515_130651.jpg> Can anyone identify/explain this to me? The same company made joysticks and other peripherals for pre-PC systems. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-370-3239 cell sales at elecplus.com --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus