Tek 4051 firmware listing

[Eric Smith]

Josh Dersch wrote:
 > I was considering it, but it's about 950 pages which makes it a 
rather daunting task.

I typed in around that many pages of listings on two different 
occasions, once for the HP-41C mainframe ROM source code, and once for 
HP 2000C Time-Shared BASIC.  Each project took a few weeks of spare 
time.  However, I don't have spare time any more, so I'm not likely to 
do this for the Tek listings.

 > Is there any OCR software that can deal with this sort of thing? This is
 > potentially made more complicated by the fact that there are horizontal
 > lines across most of the pages, which in many cases intersect with 
the text
 > (which also isn't the clearest text I've ever seen).

The aforementioned source code listings were in better shape than this 
Tek listing, and didn't have horizontal lines, but I couldn't find any 
OCR package that could handle them.  It would have taken far longer to 
clean up the OCR output than it took me to type it in myself.  OCR is 
designed for business letters, not code listings.

What I did in each case was:
1) typed in the listing *including* the line numbers, address, and 
object code
2) used an awk script to process that into a source file
3) wrote an assembler compatible with the original HP assembler
4) assembled the source code, producing a listing file
5) compared the listing file output by the assembler to the listing I 
typed in
6) correct errors
7) lather, rinse, repeat