Floppy controller questions

I did a fairly simple 765 based controller in my D6809 which does 5.25" DD disks (should work ok with 3.5" DD) - it has a 6809 bus on one side and a 34-pin connector on the other. It was designed mid-80's, and uses a 765, 9216, LS175, LS153, LS161, LS174, LS139 as well as floppy bus drivers/receivers, and a couple of LS04 gates and one LS00 gate borrowed from elsewhere in the system (The whole computer was one big wire-wrap board - you can see it on my site). I don't pretend it's the most efficient design, but it was (relatively) low parts count and worked well for me - you are welcome to it if you want it. I did polled drivers on the 09 and it worked well. One thing I did find was that I had to connect a select to the TC pin so that I could pulse it to end a transfer - I did not find a way to cleanly end a transfer in polled mode without TC. I can give you the 6809 driver code as well if you want it. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html