Re: A86: 28F0 and parser
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Re: A86: 28F0 and parser
rabidcow@juno.com wrote:
> On Sat, 16 May 1998 22:02:27 -0400 Stephen Hicks <shicks@mindspring.com>
> writes:
> >
> >Where does $28F0 get the address to ret to? I've not been able to
> >follow it.
>
> it skips one, it returns up an extra level, like it returns twice or pops
> one return address before returning.
So if the stack is:F0 28 07 21 2D 25
then it was called from 2D21?
> >
> >Also, I've been doing quite a bit of disassembling in the parser and
> >I've found these two routines on page D:
> >
> >$4C6B
> >$53AE
>
> i can't get them to work, what sort of string do they parse? i tried
> creating a string with "sin 30" and i couldn't get anything except after
> $4C6B there was an error.
Then you've gotten farther than me. This is what I've been doing - I look in
the VAT for #, and then I went to it and edited it (make sure to change the
size byte). I've just tried arithmetic because i know that "1+3" should
become "D1",0,$60,"D3",0 and "12.4-6.4" should parse to
"D12.4",0,$61,"D6.4",0. T make a little asm program, breakpoint $D748, edit
#, edit $D748 to say call whatever and then breakpoint after the call.
something is messing up tho...
> -josh
>
> >
> >I believe they both take an input of a variable in OP1 that has the
> >input in it (i.e. OP1->VAT entry for #, etc...). I think the first
> >one
> >takes a parsed string and evaluates it, and I think the second one
> >takes
> >an unparsed string and parses it. I'm not sure however. On ROM
> >version
> >1.2, they correspond to $59FD on page 3 and $5DEB on page 9,
> >respectively. If anyone can take a look at these and find out when it
> >is called, where it is called from, what it does, etc. it'd really
> >help.
> >
> >TIA,
> >Stephen Hicks
> >mailto:shicks@mindspring.com
> >ICQ:5453914
> >IRC/AIM:Kupopo
> >Hopemage:http://www.mindspring.com/~shicks/
> >
> >
> >
>
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--
Stephen Hicks
mailto:shicks@mindspring.com
ICQ:5453914
IRC/AIM:Kupopo
Hopemage:http://www.mindspring.com/~shicks/
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