When using HP-41CX (Serial 2902S21343) in program mode and scanning (or keying) successively barcodes FINDID (XROM 29,28 from HP-IL) and MAN (XROM 28,28 from IR printer), without any module inserted, we get displayed the correspondant XROM.
But when the HP-IL module is inserted alone, the codes are both diplayed as FINDID and their execution give both a FINDID.
When IR module and HP-IL module (switch on position disable) are both inserted we get back displayed the correct interpretation and the correct execution.
I have not investigated further for some other functions.
I gave the serial number of the CX as it could be related to a specific ROM.
Has somedody any explaination about this bug type ?