Wang Shuang, assembler, 296, uses variables to locate subprograms

Wang Shuang didn't use the variable. He only said it was another label method.

There is such a paragraph on the 296 page of the bookCode

 1   Charstack:  JMP  Short charstart  2   3   Table DW charpush, charpop, charshow  4   5 Top DW, 0  6   7   Charstart:  Push BX  8   9                Push  DX  10   11                Push  Di  12   13                Push  Es  14   15                CMP Ah, 2  16  17                 Ja  Sret  18   19                 MoV  BL, ah  20   21                 MoV BH, 0  22   23                 Add  BX, BX  24   25                 JMP Word PTR table [BX]  26   27 ..............................................

 

 

Problem:

I am using emu8086. The last line of code JMP word PTR table [BX] cannot always jump to the correct position.

The value of BX must be 2 each time. Table [BX] indicates the variable at the position BX/2.

Solution:

Later I found out that it was the default ds, and table [BX] is equivalent to DS: Table [BX], so of course it cannot jump correctly, as long as it is changed to CS: table [BX.

The value of BX must be 2 each time. Table [BX] indicates the variable at the position BX/2.