41CL: AMMC_OSX Rom, Bug in PGSIG?

[JurgenRo]

As per AMMC_OSX Manual Revision 4M, the PGSIG-Function "with any input argument > 15 should return the OS-Revision of the core operating System, which in case of an unmodified HP41-CX are as follows":

ROM =0:N 1:F 2:L

On my 41CL (V4 board), PGSIG 16 (for example) returns

__@ROM 0:N__1:F (where _ indicates a blanc)

with no possibility (?) to retrieve the information on page 3. Can anybody confirm that?