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TD-CMA计算机组成原理与系统结构教学实验系统是西安唐都科教仪器公司推出的新一代计算机组成原理与系统结构教学的实验设备，是按照计算机组成原理最新教学大纲和考研要求精心研发设计的，使得计算机组成原理及计算机系统结构课程变得好教好学，是国内计算机教学领域的旗帜性产品，深得广大高校计算机专业师生的喜爱。

/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ global.h ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Forrest Yu, 2005 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/ /* EXTERN is defined as extern except in global.c */ #ifdef GLOBAL_VARIABLES_HERE #undef EXTERN #define EXTERN #endif EXTERN int ticks; EXTERN int disp_pos; EXTERN u8 gdt_ptr[6]; /* 0~15:Limit 16~47:Base */ EXTERN struct descriptor gdt[GDT_SIZE]; EXTERN u8 idt_ptr[6]; /* 0~15:Limit 16~47:Base */ EXTERN struct gate idt[IDT_SIZE]; EXTERN u32 k_reenter; EXTERN int current_console; EXTERN int key_pressed; /** * used for clock_handler * to wake up TASK_TTY when * a key is pressed */ EXTERN struct tss tss; EXTERN struct proc* p_proc_ready; extern char task_stack[]; extern struct proc proc_table[]; extern struct task task_table[]; extern struct task user_proc_table[]; extern irq_handler irq_table[]; extern TTY tty_table[]; extern CONSOLE console_table[]; /* MM */ EXTERN MESSAGE mm_msg; extern u8 * mmbuf; extern const int MMBUF_SIZE; EXTERN int memory_size; /* FS */ EXTERN struct file_desc f_desc_table[NR_FILE_DESC]; EXTERN struct inode inode_table[NR_INODE]; EXTERN struct super_block super_block[NR_SUPER_BLOCK]; extern u8 * fsbuf; extern const int FSBUF_SIZE; EXTERN MESSAGE fs_msg; EXTERN struct proc * pcaller; EXTERN struct inode * root_inode; extern struct dev_drv_map dd_map[]; /* for test only */ extern char * logbuf; extern const int LOGBUF_SIZE; extern char * logdiskbuf; extern const int LOGDISKBUF_SIZE;

Preface 1 Chapter 1 Exercises Introduction 3 Chapter 2 Exercises Relational Model 7 Chapter 3 Exercises SQL 11 Chapter 4 Exercises Advanced SQL 19 Chapter 5 Exercises Other Relational Languages 23 Chapter 6 Exercises Database Design and the E-R Model 33