Re: Apple I Integer BASIC dump/listing?

[mjmahon@aol.com (Michael J. Mahon)]

Paul R. Santa-Maria wrote:

>Paul Schlyter wrote:
>> Who will be the first to post such a processed listing of the Basic
>> for the Apple I ????
>
>Well, if you check Google Groups you will see that I posted a
>partially commented disassembly of Integer BASIC for the
>Apple II back in May 2000.
>
>
>http://groups.google.com/groups?q=paulrsm+integer&hl=en&rnum=5&selm=01bfb
3c1%24a2c5df40%24LocalHost%40paulrsm
>
>My re-disassembly of the Apple I Integer BASIC took me
>50 minutes starting with the original.  I did waste some
>time before I realized that it was an Apple text file with
>CR only end-of-lines which confused one of the tools I used.
>$ECF1 was $G5.  I changed it to $55.  I do not know what
>that byte really is.
>
>I stripped off everything except the hex bytes, added .BYTE 
>to beginning of every line, assembled it to get a binary
>file, ran it through my disassembler using only a start
>address of $E000 and the routine address tables at
>$EA10 (low byte) and $EA88 (high byte).  (See the code
>at $E6EC through $E6FE.)
>
>Trivial.

Very nice job--particularly the reverse-engineering and comments!

After Paul Schlyter's prodding, I also "processed" the original
disassembly into a dump, then re-disassembled it using just
the Apple II monitor disassembler.  (I figured I'd try something
simple first, since I didn't plan to reverse-engineer it much.)

That turned up several errors, including the $ECF1 error you
mentioned (which I guessed at $B5) and several "address"
errors, where the original disassembly address was off by one.

After comparing my disassembly (uncommented) with yours,
I notice some "version" differences.  These are two very
similar, but different, versions of Apple I BASIC, apparently.

I've put my disassembly on my web page for anyone who
is interested.

-michael

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