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From: sdh@inuxm.UUCP (Stephen Hoskins)
Newsgroups: net.micro,net.micro.cpm
Subject: Re: looking for information on Intel Hex file format
Message-ID: <450@inuxm.UUCP>
Date: Thu, 9-Oct-86 09:51:54 EDT
Article-I.D.: inuxm.450
Posted: Thu Oct  9 09:51:54 1986
Date-Received: Fri, 10-Oct-86 03:43:20 EDT
References: <753@ur-tut.UUCP>
Organization: AT&T Consumer Products, Indianapolis
Lines: 37
Xref: mnetor net.micro:6230 net.micro.cpm:2463

> 
> I have a file in Intel Hex format.  This is a hex representation of a binary
> file.  I need to decode it and, ultimately, load it into memory.  Does
> anyone know how to read these files?  How to interpret the different
> fields?  Any leads or pointers?
> 
> 
> -- 
> --> Jon Krueger
> uucp: {seismo, bullwinkle, allegra, decvax, harvard}!rochester!ur-tut!tuba
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First thing on every line is a colon.
Then, 2 hex digits saying how many data bytes are in this line.
Then, 4 hex digits giving the memory address where the data should be loaded.
Then, 2 hex digits that I always ignore.
Then, there are 2 hex digits for every data byte contained in this line.
Finally, there are 2 hex digits that are a checksum over the whole line.

Here is a sample:

:10E00000C37AE0C3FAE0C3EBE0C36BE1C39CE1C3B6
:00000000

This line has 10 (hex) bytes of data and loads into RAM at E000 (hex).
The first data byte is C3 (hex); the last is C3 (hex).
The checksum is B6 (hex).
Get the idea?

By the way.  The last line in the file has a byte count of 0.
That's how you know when you're at the end of the file.

Stephen Hoskins
AT&T Consumer Products Labs
ihnp4!inuxc!inuxm!sdh