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== Add-ons Accessories ==
* Vortex X-Modul (adding RS232 support to -X drives)
* VDOS 2.0 (upgrading older drives to [[VDOS]] 2.0)
* Second drive unit (for upgrading a single -S drive to a dual -D drive)
* Adapter for a 3rd drive
<gallery>Image:Vortex 3rd drive adapter.jpg|Adapter to connect an additional 3" disc drive in between a CPC 464 and a F1-DImage:Vortex 3rd drive adapter insides.jpg|Inside the adapter boxImage:Vortex 3rd drive adapter insides closeup.jpg|Inside the adapter box (closeup)</gallery> == Technical Details == === Vortex Disk Format === === I/O Ports === '''Standard addresses (same as used by AMSDOS)''' 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)'''
Standard Addresses (same as used by AMSDOS): 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 (nearly same as normal, bit precise) (The Special special addresses are mentioned in the manual for the Vortex -X drives) (, but apparently they are referring to other/older Vortex drives, not the -X drives). The special addresses are used only on CPC 664/6128 and only if the Vortex drive includes an FDC chip.
The Special addresses are used only on CPC 664/6128 and only if the FBF6h 765 FDC (Vortex drive includes an ,ext) Status Register (Read)FBF7h 765 FDC chip.(Vortex,ext) Data Register (R/W)FA7Eh Floppy Motor On/Off Flipflop (nearly same as normal, bit precise)
The X drive has a different PCB than the PCB for the S, the manual describes connecting the DDI-1 interface to the X drive interface and a 'decoder-ROM' which defines the I/O decoding?
So, not sure if/when the Special addresses are used at all?
'''RS232 Ports (for -X drives with RS232)''' FADC/FADD=Serial Data/Control FBDC/FBDD/FBDF=Counter 0/1/Mode. So it's probably compatible with Amstrad/Pace (and probably also including, but not using, Channel channel B Ports ports FADE/FADF and FBDE).
== Vortex Disk Format ==
Image:Fd1 interface 664 platine front.jpg|F1-D Interface Board (CPC 664) Front
Image:Fd1 interface 664 platine back.jpg|F1-D Interface Board (CPC 664) Backside
</gallery>
<gallery caption="Drive Accessories">
Image:Vortex 3rd drive adapter.jpg|Adapter to connect an additional 3" disc drive in between a CPC 464 and a F1-D
Image:Vortex 3rd drive adapter insides.jpg|Inside the adapter box
Image:Vortex 3rd drive adapter insides closeup.jpg|Inside the adapter box (closeup)
</gallery>