Microsoft KB Archive/34379

= Making Multiple Initialized Far Data Segments =

Article ID: 34379

Article Last Modified on 10/22/2003

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APPLIES TO


 * Microsoft Macro Assembler 5.0
 * Microsoft Macro Assembler 5.1 Standard Edition
 * Microsoft Macro Assembler 6.0 Standard Edition
 * Microsoft Macro Assembler 6.0a
 * Microsoft Macro Assembler 6.0b

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This article was previously published under Q34379



SUMMARY
You can have multiple initialized far-data segments by using the .fardata [name] directive, as documented on page 88 of the &quot;Microsoft Macro Assembler 5.1 Programmers Guide&quot;, page 33 of the &quot;Microsoft Macro Assembler Reference&quot; and under topic fardata in the QuickHelp for versions 6.0, 6.0a, and 6.0b. Just make sure that the segments have different names. In versions prior to 6.0, it is possible to leave one of the segments with the default name. With 6.0 and later, the symbol @fardata will be the segment value of the last segment declared with .fardata [name], which may not be the one with the default name.



MORE INFORMATION
The sample program below demonstrates using two intialized far-data segments. The contents of SrcBuff will be copied to DesBuff.

The program size is very large (131k) due to the amount of data that is being declared. It may take a while to link as well.

Sample Code
; Assemble options needed: none

.model large

.fardata SrcSeg SrcBuff db    65535 dup (65)   ; 1st initialized far segment

.fardata DestSeg            ; Name 2nd fardata segment BufSeg DestBuff db   65535 dup (66)

.code main: MOV ax, SrcSeg              ; Make ds:si point to SrcBuff MOV ds, ax   MOV  si, 0

MOV ax, DestSeg             ; Make es:di point to DestBuff MOV es, ax   MOV  di, 0

MOV cx, 0ffffh              ; copy full segment

REP movsb                   ; automatically inc si & di, ;   dec cx until it is 0 MOV ah, 4ch INT 21h

END main

Additional query words: 5.00 5.10 6.00 6.00a 6.00b

Keywords: KB34379

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