// Message structure: 16 bytes in total
struct ipc_message {
 unsigned char from;
 unsigned char to;
 unsigned char priority;
 unsigned char sequence;
 unsigned char[12] message;
};
struct ipc_message[1] ipc_buffer;
struct ipc_message *ipc_read() {
 enable_syscalls();
 *(unsigned char *)$D649 = $00;
 asm { nop }
 // Copy returned structure in to return buffer
 unsigned char *a=(unsigned char *)ipc_buffer;
 unsigned char *b=(unsigned char *)$0300;
 for(unsigned char i=0;i<16;i++) a[i]=b[i];
 // Return address of return buffer
 return ipc_buffer;
}