Coprocessor loads and stores 

RDTBR and WRTBR 

TBR no longer exists. It is replaced by TBA, which can be read/written with RDPR/WRPR instructions 

RDWIM and WRWIM 

WIM no longer exists. WIM has been replaced by several register-window registers 

REPSR and WRPSR 

PSR no longer exists. It has been replaced by several separate registers that are read/written with other instructions 

RETT 

Return from trap (replace by DONE/RETRY) 

STDFQ 

Store Double from Floating-point Queue (replaced by the RDPR FQ instruction