3½" floppy drives can be fitted quickly to the external floppy drive port on the Einstein with a standard PC floppy drive data cable. Without alteration of the data lines on the ribbon cable it will act as drive 01 or B. To act as a boot drive 0 or A the ribbon cable can be altered.
The Standard PC floppy disk cable for a 01/B drive.
This IDC plug will be attached to the floppy drive.
If the cable is left like this the floppy drive will be 01 or B.
Connects to the Einsteins external floppy drive port.
Do NOT use this IDC after the twist.
If instead line 14 from the Einstein’s external port is joined to line 12 to the
floppy drive the drive will become 02/C. If line 6 is cut and joined to 12 the floppy
drive will become 03/D. With either of these adaptations opening up the Einstein
and changing internal 3” drives might not be necessary to have a working 31/2” drive.
The boot drive would remain an internal 3” drive in this case.