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Format of DOS 4.x error table

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Offset Size Description

00h

BYTE

FFh

01h

2 BYTEs

04h,00h (DOS version???)

03h

BYTE

number of error headers following

04h

2N WORDs

table of all error headers for table
Offset Size Description

00h

WORD 

error message number

02h

WORD 

offset of error message from start of header
error messages are count byte followed by msg

Note:

DOS 5 error tables consist of one word per error number; each word contains either the offset of a counted string or 0000h.