Sd card cmd8 invalid response

[shari2643]

COMPILER:     HITECH C18 9.8
CONTROLLER: PIC18F4520
SIMULATION: PROTEUS ISIS

Hi ppl .I am making a data logger for SD,MMC CARD. FOR SD CARD initialization command CMD8(for sd cards v2+) i am getting invalid command response. CMD0 is giving valid response ie 01. I am sending the following command

CMD8 = 0x48 0x00 0x00 0x01 OxAA 0x87

Response i should be getting is 05 . what i am getting is 04 (As proteus has no SD CARD SO I AM USING MMC CARD IN SIMULATION).Is 04 response ok?
kindly If anyone of you could spare a few moments and give a direction.

 SS=0;
//CMD8 
	  WriteSPI (0x48);
	  WriteSPI (0x00);
	  WriteSPI (0x00);
          WriteSPI (0x01);
          WriteSPI (0xAA); 
	  WriteSPI (0x87);	
	  ReadSPI();
	  save=ReadSPI();

//RESPONCE OF CMD8 is
				USARTWriteLine(" ");
	       		        USARTWriteString("   THE RESPONCE OF CMD8 IS :");
				USARTWriteInt(save,2);
				USARTWriteString("\r\n");
	 if(save==0x1AA) //IF RESPONSE IS 0xAA
	 {
		USARTWriteString("**SD CARD IS V2 OR HIGHER**");	
     }
	 else // IF RESPONSE IS 1 
	 {
	  	USARTWriteString("**CARD IS MMC OR SD CARD V1 **");
	 }		
	  SS=1;