Aunc.3389
net.micro
utzoo!decvax!duke!unc!jqw
Sun May 2 20:35:47 1982
Intel Hex Format

       Thanks to all the replies to my question, here is the complete (?)
Intel hex format.
Note that bytes are stored as ASCII hex nybbles,
               00 to FF
All calculations (length and checksum) are made with original bytes, not ASCII
representation.


       The general form of a record is as follows:

       :LLaaaaRRdddd..ddCC

       where LL is the number of bytes of data between RR and CC,
       not including RR or CC.
       aaaa is an address (see below),
       RR is a record type,
       dd are data bytes,
       and CC is a checksum, calculated as follows:
          CC = - ( LL + aaaa + RR + dd + dd + ... ( modulo 256 ) )
       That is, adding all the bytes LL to CC (inclusive), you should get zero.

For sixteen-bit address files (for 8080 and Z80) these are the record types
needed:
       RR = 00 record type = data. aaaa is the load address for the data.
       RR = 01 record type = end of file.
               aaaa is the beginning execution address.
               LL is 00.
               :00aaaa01CC

For extended address files (for 8086, etc.), there are two more record types.

       RR = 02 record type = Extended Address
               :02000002eeeeCC
               where "eeee" is bits 4 to 19 of the address where data should
               be loaded. All addresses in data records are added to this
               to form the full address. If there is no extended address
               record, the base address is assumed to be zero.

       RR = 03 record type = Start Address
               :04000003PPPPiiiiCC
               where PPPP is the 8086 code segment register,
               and iiii is the Instruction pointer register.
               If this record is used, the address in the end
               of file record should be set to zero.

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