Willsy Posted October 30, 2012 Share Posted October 30, 2012 Can anyone tell me how the checksum field in an ED/AS #3 is generated? Is it documented anywhere? Also, what is the format of a compressed object file? It doesn't seem to be discussed in the ED/AS manual. Any help/pointers appreciated! Quote Link to comment Share on other sites More sharing options...
Willsy Posted October 30, 2012 Author Share Posted October 30, 2012 Actually, it looks like I missed this in the ED/AS book: "Tag character 7 precedes the checksum, which is an error-detection word. The checksum is the two's complement of the sum of the 8-bit ASCII values of the characters in the record from the first tag of the record through the checksum tag." No discussion of compressed object code though... Perhaps it's just a hex byte stream with very few tags. Time to fire up the text editor and start hacking...! Quote Link to comment Share on other sites More sharing options...
+Lee Stewart Posted October 30, 2012 Share Posted October 30, 2012 (edited) Actually, it looks like I missed this in the ED/AS book: "Tag character 7 precedes the checksum, which is an error-detection word. The checksum is the two's complement of the sum of the 8-bit ASCII values of the characters in the record from the first tag of the record through the checksum tag." No discussion of compressed object code though... Perhaps it's just a hex byte stream with very few tags. Time to fire up the text editor and start hacking...! This from Thierry's site: "In compressed files, data words are passed as integers, and no checksum nor record number is issued." ...lee Edited October 30, 2012 by Lee Stewart Quote Link to comment Share on other sites More sharing options...
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