书上系统时钟例程能看懂，但后面对该例程的优化看不明白了。怎么将下面这段代码与时钟系统的c程序连接起来呢？我试了好长时间，一直没成功。
CSEG AT 0400H
bcdmap: DB '0' ,'0'
DB '0' ,'1'
DB '0' ,'2'
...
DB '5' ,'7'
DB '5' ,'8'
DB '5' ,'9'
END
此帖出自小平头技术问答
但如果用CSEG AT 0400H，就会出错。提示*** WARNING L9: EMPTY SEGMENTS ENCOUNTERED
$NOMOD51
NAME BCDMAP1
?CO?bcdmap1 SEGMENT CONST
PUBLIC bcdmap
//RSEG ?CO?BCDMAP1
CSEG AT 0400H
bcdmap:
DB '0', '0'
DB '0', '1'
....
DB '5' ,'9'
END
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$NOMOD51
NAME BCDMAP1
?CO?bcdmap1 SEGMENT CONST
PUBLIC bcdmap
//RSEG ?CO?BCDMAP1
CSEG AT 0400H
bcdmap:
DB '0', '0'
DB '0', '1'
....
DB '5' ,'9'
END
CSEG AT 0400H
不能和下面的标号紧贴，和上面一句话句对换一下位置，即可。
$NOMOD51
NAME BCDMAP1
?CO?bcdmap1 SEGMENT CONST
PUBLIC bcdmap
PUBLIC abcdef
CSEG AT 0400H
bcdmap:
DB '0', '0'
DB '0', '1'
....
DB '5' ,'9'
RSEG ?CO?BCDMAP1
abcdef:
DB '0'
END
$NOMOD51
NAME BCDMAP1
?CO?bcdmap1 SEGMENT CONST
PUBLIC bcdmap
PUBLIC abcdef
RSEG ?CO?BCDMAP1
abcdef:
DB '0'
CSEG AT 0400H
bcdmap:
DB '0', '0'
DB '0', '1'
....
DB '5' ,'9'
END
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