Image:Vortex 3rd drive adapter insides closeup.jpg|Inside the adapter box (closeup)
</gallery>
=== FDC I/O Ports ===
The controller is using a NEC 765 chip.
'''CPC 464:'''
{| class="wikitable"
|-
! Address !! Description
|-
| 0xFB7E || uPD control (R)
|-
| 0xFB7F || uPD data (R/W)
|-
| 0xFA7E || motor on/off
|}
'''CPC 664/6128:'''
{| class="wikitable"
|-
! Address !! Description
|-
| 0xFBF6 || uPD control (R)
|-
| 0xFBF7 || uPD data (R/W)
|-
| 0xFA7E || motor on/off
|}
== Z-Drives (180K) ==
See [[VDOS#Vortex_Disc_format|VDOS: Vortex Disc Format]]
== Drive Interface I/O Ports ==
The drives interfacing with their own FDC can be used with the CPC 6128 to use different I/O ports (see below).
'''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)'''
The 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.
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 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?
* Note1: The -Z and -X drives do not include FDC chips.
So, not sure if/when the Special addresses are used at all?
[[Category:Peripherals]] [[Category:Manual]][[Category:DATA Storage]]
