Changes
/* I/O Ports */
FB7Eh 765 FDC (internal) Status Register (R)
FB7Fh 765 FDC (internal) Data Register (R/W)
FA7Eh Floppy Motor On/Off Flipflop
Special Addresses (secondary FDC):
FBF6h 765 FDC (Vortex,ext) Status Register (Read)
FBF7h 765 FDC (Vortex,ext) Data Register (R/W)
FA7Eh Floppy Motor On/Off Flipflop (same as normal)
(The Special addresses are mentioned in the manual
for the Vortex -X drives) (but apparently they are referring
