physical is a .1 grid of square pins coming off of a flex cable to the head stack.
electrical is you supply a bias current and directly read magnetic flux with an opamp I traced all of that out the last time I made a run at this windmill. John used an FPGA development board with an 18 channel A/D, which also controlled modified firmware on the motor driver and digitizes the tach pulse to get actual tape speed. Unfortunately, he never sent me the FPGA code, so I have to come up with my own digitizer and figure out how to drive the transport. Fortunately, it's a 9914V (vertical mount), so it isn't auto-loading. I did get a tape to move to loadpoint from the front panel, so the mods might not be too bad. He did send me a disassembly of the microcontroller code with the patches he made. Reading this presentation, I think he switched to 3490 36 track heads at some point. http://storageconference.us/2008/presentations/3.Wednesday/5.Bordynuik.pdf MANY years ago, I bought a dozen 3480s in Chicago and stripped them for the heads at my parent's farm in Wisconsin, so I could try grafting one onto another transport if I had to. I've been unsuccessfully trying for years to get the schematics for a 9914 or 9914V (they aren't inlcuded in the service manual). On 8/12/16 12:29 AM, emanuel stiebler wrote: > On 2016-08-11 20:36, Al Kossow wrote: >> One of the highest projects I have in the queue is getting one of John's >> M4 9914V drives with 18 track MR heads running in my new lab at CHM. > > What's the interface on the 18 track head? >
