The DS64 quad switch (accessory) decoder is similar to the DS54. Some differences make it easier to understand and use, while other differences make it less versatile. Regardless, the DS54 is discontinued, so any comparison is useless at this point.

Here is the DS64 feature list:

• Can control either 4 slow-motion machines (Tortoise, etc.), or 4 solenoid-type machines, polarity-sensitive (Kato & Aristocraft) and/or bi-polar (Atlas, Peco, et al.)
• Integral capacitor discharge
• Switch inputs for various controls:
  • Switch control
  • Route control
  • Block detection
  • Turnout feedback
• LocoNet Controls for:
  • Block detection with BD4 block detectors
  • Turnout feedback
  • Route control
• Buffered switch Inputs allow the capacitor to recharge before snapping the next switch machine
• Operates from track or auxiliary power
• Can get signal from track or LocoNet
• Supports up to 8 routes
• Screw terminals for easy hookup

The DS64 comes with a housing, and screw terminals are labeled for easy hook-up. There is no programming other than for addresses. All other configuration is through OpSw settings using buttons on the DS64. The DS64's inputs are tied to the outputs. That is, there are two inputs tied to output A, two to output B, and so on. If output A is programmed to be turnout #9, for example, the inputs for that turnout can only affect output A (turnout #9). This means there is no way to control turnouts controlled by other switch decoders from a local input. Further, inputs cannot be configured individually. You can't have one input toggling its turnout while another throws or closes its turnout, while another sends feedback, and yet another does something else. There are combinations that allow some variations, but those are finite. For example, it can be configured for all of the inputs to throw and close their respective outputs. Or, they can be configured where one input will toggle its input while the other sends positive feedback. Or, they can be configured to send block detection messages. Or..., you get the idea.

Here are all of the combinations:

• All inputs used to trigger routes programmed into the DS64
• All inputs send General Sensor messages
• All inputs send Exact Turnout Feedback messages
• "S" inputs close related outputs, "A" inputs throw related outputs
• "S" inputs toggle related outputs, "A" inputs send General Sensor messages
• "S" inputs toggle related outputs. "A" inputs send Positive Turnout Feedback messages
• Lastly, using any of the configurations above, any set of inputs can be configured to control flashing lights for a grade crossing. When a turnout is controlled via any local input, a LocoNet message is always sent accordingly - providing LocoNet is connected. This means that memory turnout feedback, rather than by Positive or Exact feedback, will be updated.