Looking at the circuit of the Qume drive, it is certainly not designed to work with disks with both holes, I can only imagine that drives only expected disks to be one or the other when it was designed, but it could easily be modified with a three position On-Off-On switch to disable either index sensor, or to have both working as usual...
Robin -----Original Message----- From: Chuck Guzis via cctalk <cctalk@classiccmp.org> Sent: 22 September 2022 20:23 To: cctalk@classiccmp.org Cc: Chuck Guzis <ccl...@sydex.com> Subject: [cctalk] Re: 8" disk question! On 9/22/22 12:04, geneb via cctalk wrote: only one index sensor (typically an SS drive). > > I've got at least three boxes of NOS Dysan disks with both of those > index holes present, so they certainly were made commercially. Yup. I've got similar NOS ones also. --Chuck
