On Sun, 30 Nov 2008, David Empson wrote:

> lyricalnanoha  wrote:
>
>> On Sun, 30 Nov 2008, David Empson wrote:
>>
>>> lyricalnanoha  wrote:
>>>
>>>> I've managed to find Applesoft 1, the original buggy
version, and I'm
>>>> trying to reverse-engineer it to port since the
"7-in-1 MS 6502 BASIC"
>>>> produces broken output - but I've got a big question...
>>>>
>>>> ...what memory space does it load into? (Stupid obfuscated
BASIC loaders.)
>>>> I can't seem to figure out the info I'd need to be able to
save it or to
>>>> export it so I can extract the binary and feed it to IDA
or something...
>>>
>>> I wasn't using the Apple II that far back but it seems reasonable to
>>> assume the original version of Applesoft would have been loaded from
>>> tape into main memory, either near $0800 or at the top of main memory.
>>>
>>> Putting it at the bottom would have been easier because it wouldn't need
>>> to relocate depending on the amount of RAM installed.
>>>
>>> It predated the language card, so that area is out of the question. DOS
>>> may not have been in the picture either, but it may have gone to some
>>> trouble to respect Integer BASIC's LOMEM and/or HIMEM.
>>
>> I've heard it loads at $800, it does seem to have code around there but
>> the entry point's not down there.  Hm.
>
> It might load at $7F8 (or thereabouts) and jump to the correct entry
> point (which is likely to be the equivalent of $E000).
>
> Is it possible to have a two-stage tape loader? If so, perhaps there is
> a front end loaded somewhere else (maybe somewhere in $0200-$03EF), and
> the main image is loaded at $0800, with the front end jumping to the
> "cold" entry point.
>
> --
> David Empson
> dempson{at}actrix.gen.nz
>

This copy's on a disk and works fine that way.

-uso.
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