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RM2 Tech Notes

Microcode mismatch after upgrade


Product: RP2, RP2.1, RA16BA, RV8, RM1, RM2
Version: > v80
Date Added: 2016-08-02


After updating to v84 TDT drivers (or above) and updating the microcode on the devices in your system, zBUSmon will show a mismatch (red lettering) and indicate the version number is 80 for the following devices: RP2, RP2.1, RA16BA, RV8, RM1, and RM2.


The latest microcode version for these devices is v80. You can still use the "Update All Devices" command to update your system's microcode. The microcode installer can detect the device types and install the correct microcode according to the device type. In this case, you can safely use both microcode versions in your system as needed. You will see a microcode mismatch indicator (red lettering) for devices using v80, but you can disregard the warning indicator in this situation.


Upgrade to the latest version of TDT Drivers. The mismatch indicator no longer erroneously appears for these devices.

No signal on RM1/RM2 ADCs


Product: RM1, RM2
Version: All
Date Added: 2013-04-13


In some cases the ADCs on the RM1 and RM2 may not work even though the DACs are working. Users can usually still see the device in zBus Monitor and the device can pass a transfer test.


The RM1/RM2 will have this problem when connected to some USB ports but not on others, even on the same PC.

  1. If possible, try moving the RM1/RM2's USB connection from one port to another port on the PC.

  2. If a second USB port is not available or does not resolve the problem, insert a USB hub between the PC and the RM1/RM2.

The "Gigaware 4-Port Stackable USB Hub" has been tested and was found to be a reliable option for this application; however, most other USB hubs should also work.

DC signals played out on the RMx analog outputs quickly decay to zero


Product: RM1, RM2
Version: All
Date Added: 2005-07-28


The RMx devices are not able to play out DC or very low frequency (<1 Hz) signals. This is because of a 0.16 Hz highpass filter on the D/A converter. Also, because of the roll off of this filter, users may see attenuation in signals played out with frequencies less than 10 Hz.