The Amiga was much more closely tied to the hardware than the ST, by dint of it's bus system sharing between the blitter and CPU for chip RAM.Īdditionally, having the copper, sprites, scrolling, HAM and planar graphics modes meant that backwards compatibility is harder - just look at the difficulty of emulation for both of them. The only personal computer Floppy drives with flexible head positioning all used voice coil head actuator - Floptical, LS-120/240, Zip drives etc. The whole point of using a stepper motor is you dont have to worry about head tracking/alignment. All you are able to do is pick direction and step one track at a time. Floppy drive has a STEP (/STEP) and DIRECTION (/DIR) pins. Its impossible to move HEAD stepper motor between tracks. >If you formatted the disk with the tracks spaced closer together, by altering the stepper movement during that process, you would 'magically' get more space. "certain known amount" being one step per track
> For an 80 track disk, the movement required to step between tracks was a certain known amount. This driver in turn received instructions from a dedicated Floppy drive controller (WD1771 and compatibles). No, it was under control of a stepper motor driver circuit located directly on a Floppy drive pcb. >In the ST era, the control of that motor was directly under the control of the operating system.
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