Re: A86: Customizable Stuff

[Prev][Next][Index][Thread]

Re: A86: Customizable Stuff


You first must get the TI-86 emulator for Windows, from ticalc.org and get
it working.  Next, determine a call that the subroutine you are looking for
calls - this is your GUESS. Example: for ">frac", I knew (or at least was
pretty sure) that it must call _FPDIV sometime.  So in the emulator I
disassembled at the address for _FPDIV and it said call $xxxx.  I went to
address $xxxx and it had a template call $28CB followed by 3 bytes.  The
first two bytes are the word of the address, the third byte is the ROM page.
So I disassembled at the given address and also wrote the ROM page number
out to port number 5 (Be sure to read the help on the emulator before doing
this).  Now I had an address, and so I double-clicked to set up a break
point.  Now I started the emulator and typed ".4>frac" and the emulator
halted (if it doesn't your guess was not good).  Now I looked at the first
two bytes of the stack display, swapped them and it gave me the address of
the calling routine.  I disassembled to there and then kept going up until I
find an unconditional jr, jp, or ret instruction.  Then I write down this
address, and input from port 5 and write down the ROM page.  Now, using
search, I search for $CD,$CB,$28,$xx,$yy,$zz: xx being the low byte of the
address written, yy the high byte, and zz the ROM page.  You want the one
occurring from about $3000-$3fff (if it doesn't, your call does not exist on
page $0D).  Now I write down this number and search ROM page $0D for a call
to that address... which gave me a source address of $4B93.

Maybe I should have had an intermission in there?

===

Kirk Meyer
_@ibm.net

-----Original Message-----
From: Butler Family <butler2@erols.com>
To: assembly-86@lists.ticalc.org <assembly-86@lists.ticalc.org>
Date: Monday, February 16, 1998 7:36 PM
Subject: Re: A86: Customizable Stuff


|
| could you tell us how to look for our own calls?  i think i have a vague
idea
|on what to do but any help would be appreciated
|
|thanx
|Patrick
|
|Kirk Meyer wrote:
|
|> Yes, mine converts _OP1 into a fraction, _OP1 = numerator and _OP2 =
|> denominator; the one you're talking about I think does "frac(OP1)" or
|> something.  It's address on ROM page $0D is : $4B93
|>
|> If any of you want me to TRY to look for a CERTAIN call, I will if you
send
|> me (not the list please) the one you want.
|>
|> ===
|>
|> Kirk Meyer
|> _@ibm.net
|>
|> -----Original Message-----
|> From: Robby Gutmann <gutmann@planet-connect.com>
|> To: assembly-86@lists.ticalc.org <assembly-86@lists.ticalc.org>
|> Date: Monday, February 16, 1998 7:15 PM
|> Subject: Re: A86: Customizable Stuff
|>
|> |
|> |I just now found the address for the call for ">frac", previously not
|> |>known. How long did it take? about 10 minutes. Give TI a break!
|> |
|> |there is a call in ti86ops.inc that supposedly converts the floating
point
|> |number in OP1 to a fraction, but i've never been able to make it work.
is
|> |yers different?  if so, can u release it, so we can use it.  id
appreciate
|> |it, thanx.
|> |
|> |Robby Gutmann
|> |gutmann@planet-connect.com
|> |ICQ UIN: 724927      Agonostis on IRC
|> |
|> |"Let's just say that if complete and utter chaos was lightning,
|> |he'd be the sort to stand on a hilltop in a thunderstorm wearing
|> |wet copper armour and shouting 'All gods are bastards'."
|> | -- Rincewind discussing Twoflower
|> |    (Terry Pratchett, The Colour of Magic)
|> |
|> |
|
|
|
|
Follow-Ups: