paulusd wrote:Got no idea what's happening to this this now....
the head in the floppy drive just bumps into the endstop then repeats about 3-4 seconds later … after 2 minutes or so the Atari boots and shows floppy icons but clicking on one leads to a repeat of the first situation....
I replaced the floppy cable after I somewhat butchered it , and internally modded a Sony MPF920...with the same result......HELP!!!!!!!
It's always a good idea to try to understand the mods before executing them.
In this case it is the difference in how PC adress the floppy and how Atari does it. The IBM world, to make it easy on themselves, always set floppy drive ID to 1, if you add a second drive, the famous twist in the middle of the ribbon cable on PC's switch the ID0 and ID1 signals... So all floppys you'll find that are not original ST floppys will be set to ID1.
But atari expects the drive to be assigned ID0... Some drives have jumper settings for that, but many do not.
There is a guide here: viewtopic.php?t=14049