Re: Apple 5.25 Diskettes?

[Patrick Schaefer <pa.schaefer@fz-juelich.de>]

Paul Guertin wrote:

> Would it be possible to replace the drive head in a Disk ][
> with a high-density head (that presumably has a stronger, more
> concentrated magnetic field) and expect it to work without too
> many modifications?

You would have to replace the head amplifier, too. The easiest way
should be using a complete TEAC55GFR HD drive with an Erphi or Ehring
controller (PC drives need Step and Direction pulses instead of the four
phases, therefore a Disk II controller cannot be used).

There may still be a problem: HD drives expect a 500 kHz data stream
instead of 300 (250) kHz.


Patrick