online asm in c51, what is the matter?

I use this code: #include <reg52.h> void main(void) { unsigned char data x8,x9,x10; while(1) { x8 = 0; x9 = 9; x10 = x8 + x9; __asm CLR A; } } and the SRC file is look like this, I think...
online asm in c51, what is the matter?

I use this code: #include <reg52.h> void main(void) { unsigned char data x8,x9,x10; while(1) { x8 = 0; x9 = 9; x10 = x8 + x9; __asm CLR A; } } and the SRC file is look like this, I think...
Some matter with my "printf()",what can i do ?

When program running to "printf()",the PC always stop at C:0X0A2A 3099FD JNB TI(0X98.1),C:0A2A I try adding some word as following : ES = 0; //UART INT is Enable before TI = 1; printf("%bd",3);...
Some matter with my "printf()",what can i do ?

When program running to "printf()",the PC always stop at C:0X0A2A 3099FD JNB TI(0X98.1),C:0A2A I try adding some word as following : ES = 0; //UART INT is Enable before TI = 1; printf("%bd",3);...
GSM modem returns rubbish symbols no matter the command sent

Good day. I have a WAVECOM 16 port GSM modem. I have been able to connect to the device through a serial connection using PUTTY. No matter what command I send I get back random rubbish responses...