Hi, my version of the MACRO11 cross-assembler for PDP-11 is now on https://github.com/j-hoppe/MACRO11 . Among others it fixes the "JMP Rn is illegal" error on "jmp (rx)" opcode. Also I added the option "listhex" to produce a binary listing in hex notation instead of octal. I found this really necessary when analyzing test programs with a modern logic analyzer. Joerg