微机原理与接口技术(钱晓捷版)课后习题答案(12)

计算机专业--微机原理与接口技术(钱晓捷版)课后习题答案

③ EAX＝0013H ④ EAX＝0003H 〔习题3.14〕

按照如下输出格式，在屏幕上显示ASCII表： | 0 1 2 3 4 5 6 7 8 9 A B C D E F ---+-------------------------------- 20 | ! “ # ... 30 | 0 1 2 3 ... 40 | @ A B C ... 50 | P Q R S ... 60 | ‘ a b c ... 70 | p q r s ...

表格最上一行的数字是对应列ASCII代码值的低4位（用十六进制形式），而表格左边的数字对应行ASCII代码值的高4位（用十六进制形式）。编程在数据段直接构造这样的表格、填写相应ASCII代码值（不是字符本身），然后使用字符串显示子程序DISPMSG实现显示。 〔解答〕

include io32.inc .data table byte ' |0 1 2 3 4 5 6 7 8 9 A B C D E F',13,10 byte '---+-------------------------------',13,10 byte

|',20h,20h,21h,20h,22h,20h,23h,20h,24h,20h,25h,20h,26h,20h,27h,20h,28h,20h,29h,20h byte 2ah,20h,2bh,20h,2ch,20h,2dh,20h,2eh,20h,2fh,20h,13,10 byte

|',30h,20h,31h,20h,32h,20h,33h,20h,34h,20h,35h,20h,36h,20h,37h,20h,38h,20h,39h,20h byte 3ah,20h,3bh,20h,3ch,20h,3dh,20h,3eh,20h,3fh,20h,13,10 byte

|',40h,20h,41h,20h,42h,20h,43h,20h,44h,20h,45h,20h,46h,20h,47h,20h,48h,20h,49h,20h byte 4ah,20h,4bh,20h,4ch,20h,4dh,20h,4eh,20h,4fh,20h,13,10 byte

|',50h,20h,51h,20h,52h,20h,53h,20h,54h,20h,55h,20h,56h,20h,57h,20h,58h,20h,59h,20h byte 5ah,20h,5bh,20h,5ch,20h,5dh,20h,5eh,20h,5fh,20h,13,10 byte

|',60h,20h,61h,20h,62h,20h,63h,20h,64h,20h,65h,20h,66h,20h,67h,20h,68h,20h,69h,20h byte 6ah,20h,6bh,20h,6ch,20h,6dh,20h,6eh,20h,6fh,20h,13,10 byte

|',70h,20h,71h,20h,72h,20h,73h,20h,74h,20h,75h,20h,76h,20h,77h,20h,78h,20h,79h,20h byte 7ah,20h,7bh,20h,7ch,20h,7dh,20h,7eh,20h,7fh,20h,13,10 byte 0 .code start: mov eax,offset table call dispmsg exit 0 end start

'20

'30

'40

'50

'60

'70

〔习题3.15〕

数据段有如下定义，IA-32处理器将以小端方式保存在主存：