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HEX representation for higher memory ????????

 
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moutinho



Joined: 12 May 2005
Posts: 31
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HEX representation for higher memory ????????
PostPosted: Tue May 17, 2005 12:40 pm     Reply with quote
HI,

The HEX file has the following fields:
:BBAAAATTHHHH....HHHCC
BB - byte count
AAAA - adddress
TT - record type
00-data record
01-end of file record
02-segment address record
04-linear address record
HH - data byte
CC - checksum

I can represent with AAAA up to FFFF or 64KBytes

How does HEX file represent data in 0xFFFF higher memory ? such as 0x1FFFF

Thank,
Andre
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue May 17, 2005 1:15 pm     Reply with quote
If you search http://www.google.com for the quoted string,
"hex file format", you will get over 2000 hits.
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PostPosted: Tue Aug 16, 2005 10:57 am     Reply with quote
When people say:

Quote:

If you search http://www.google.com for the quoted string,
"hex file format", you will get over 2000 hits.


What they mean is "I don't know."

However, I do.

Here is the format again:

:BBAAAATTHHHH....HHHCC
BB - byte count
AAAA - adddress
TT - record type
00-data record
01-end of file record
02-segment address record
04-linear address record
HH - data byte
CC - checksum

That "04-linear address record" is important. What it is saying is "hey, I am now switching to a new location that is beyond 0xffff". For example:

:020000040030CA

Says to change the address so the following will be at 0x0030nnnn. The next record will then be at 0x0030nnnn. You might think of it as something like bank switching.

Hope that makes some sense!
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