HP 64000 relocatable file format / assembler

[Philip Pemberton]

J. David Bryan wrote:
> I use the HP 10391B Inverse Assembler Development Package with my 64620 
> state analyzer.  The .R file produced by the IA is nearly compatible with 
> the 64000.  To use it, though, I had to write a program to:
> 
>  1. strip off that 20-byte header, and
>  2. alter the NAME record to conform to the 64000 relocatable format

Yeah, I noticed that there was "something" different about the file. I 
can get the checksum for the NAME record to match up perfectly, then 
there's a DOUBLE record after that. The checksum for that NEVER matches 
up and I can't find the criteria for making it do so. My code just hits 
the 128-word limit and bails out :-/

>  The IAL assembler produces a variable-length
>    field containing the full pathname (drive, directories, filename, and
>    extension) to the source file.  We convert the latter by using the
>    base filename, which will be eight characters or less, as the IAL
>    assembler is a DOS program, as the filename. We set the user ID to
>    "IAL" and the disc number to zero.  All other portions of the Name
>    Record are valid and are copied into the 64000 version, and a new
>    checksum is calculated. 

I'll have a look at that -- for now, all my IAL files have been 
assembled in C:\IA, so the filenames are quite short ("C:\IA\I8085.S" as 
an example; 13 characters plus the null).

I don't suppose you have some code (or even snippets of code) that you 
could share?

Thanks,
-- 
Phil.
classiccmp at philpem.me.uk
http://www.philpem.me.uk/