When you say RSP card, you mean the Flash card?
For RSP1 and RSP2 the command is "show slot0:"
For RSP4/4+, RSP8, and RSP16 the command is "show slot0:" and "show slot1:"
Other than the Flash card, the other types of memory in RSP are;
DRAM Memory SIMM and FLASH SIMM for RSP1 and RSP2
DRAM Memory DIMM and FLASH SIMM for RSP4/4+, RSP8, and RSP16