By the way, this circuit could be illegal in your country. Please consider it "for educational purposes only" :-).
I modified a Sony DTC790 DAT recorder using a circuit designed for recorders
with a CXD2601 chip. This schematic can be found at DAT
heads home page, and with more info on Philipp
Born's page. The Sony DTC790 has a CXD2605 chip, but it is compatible
enough for the SCMS killing circuit. It is my guess the circuit will work
with all recorders with the internal signals EXCK, SDS0, SBSY. The circuit
disables SCMS on all incoming digital data streams. Analog input recordings
and play back data streams are not affected.
All the used signals have testpoints near the CXD2605 chip, so no soldering on the chip's pins is neccesary.
Recorders known to have a CXD2605:
The wires can be led through a small free hole in the board to the upper side, where plenty of room is available for attachment.
Three signal connections (EXCK, pin 23; SDS0, pin 25; SBSY, pin 26), and two for the power supply. You can disable the circuit by disconnecting the line to SDS0. See the connection diagrams I made for the prototypes: picture 1 and picture 2.
Below is a picture of a board I designed for this circuit, including a coaxial output interface (click on it to get the PostScript file).
If you have a stand alone audio CD recorder see this article from Stereophile