[A83] Re: What is the problem with flash writes (in general)
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[A83] Re: What is the problem with flash writes (in general)
And they didn't fix that bug in future versions?
----- Original Message -----
From: "Kirk Meyer" <kirk.meyer@colorado.edu>
To: <assembly-83@lists.ticalc.org>
Sent: Monday, July 09, 2001 11:18 PM
Subject: [A83] Re: What is the problem with flash writes (in general)
>
> To my knowledge, TI had a bug where if a certain error message occurred
> while writing to Flash, Flash support would still be enabled. There may be
> other ways around it also.
>
> -----Original Message-----
> From: assembly-83-bounce@lists.ticalc.org
> [mailto:assembly-83-bounce@lists.ticalc.org]On Behalf Of Tijl Coosemans
> Sent: Monday, July 09, 2001 3:11 PM
> To: assembly-83@lists.ticalc.org
> Subject: [A83] Re: What is the problem with flash writes (in general)
>
>
>
> If I had an 83+ I would 've tried it (and probably have come to the
> conclusion that it is impossible)
>
> btw: Isn't there on the 89 some program that patches the rom. Probably
> because they can enable flash writes, what we can't.
>
> ----- Original Message -----
> From: "Hyperbyte" <hyper@hysoft-automation.com>
> To: <assembly-83@lists.ticalc.org>
> Sent: Monday, July 09, 2001 10:46 PM
> Subject: [A83] Re: What is the problem with flash writes (in general)
>
>
> >
> > This would ONLY work if TI had been so foolish as to not include
> > the singing in Calc-To-Calc OS transfers.
> > I'm sure they weren't that foolish!
> >
> > You're welcome to try though, but I'm sure it won't work.
> > --(Peter-Martijn)
> >
> > >
> > >
> > > You don't need two calcs. You can also use a VTI to calc link and then
> use
> > > VTI's debugger to analyse things.
> > >
> > > The problem with simulating the computer though is that you first have
> to
> > > know what the computer does.
> > >
> > > ----- Original Message -----
> > > From: "Dan Englender" <dan@calc.org>
> > > To: <assembly-83@lists.ticalc.org>
> > > Sent: Monday, July 09, 2001 10:12 PM
> > > Subject: [A83] Re: What is the problem with flash writes (in general)
> > >
> > >
> > > >
> > > > I did something very similar to determine link commands for other
> things.
> > > I
> > > > used Calcsys's Link Console (actually, I wrote the link console for
> that
> > > > purpose). And, assuming you've got a fairly new version of Calcsys,
> you
> > > can
> > > > store the strings to reply with in RAM, and then send them by just
> typing
> > > > the address, instead of typing out the whole strings.
> > > >
> > > > If you have two TI-83P's (or know someone from whom you can borrow
> one)
> > > > you're in especially good luck You don't have to search through the
> ROM
> > > for
> > > > the proper reply (something I wouldn't really suggest doing), but
> instead
> > > > you can use one of the calculators to simulate the computer, and see
> what
> > > > the reply is firsthand.
> > > >
> > > > Or you could build a custom program, whichever you want :)
> > > >
> > > > -Dan Englender
> > > >
> > > > ----- Original Message -----
> > > > From: "Tijl Coosemans" <tijlc@hotmail.com>
> > > > To: <assembly-83@lists.ticalc.org>
> > > > Sent: Monday, July 09, 2001 4:09 PM
> > > > Subject: [A83] Re: What is the problem with flash writes (in
general)
> > > >
> > > >
> > > > >
> > > > > You should write a receive program for your calc, which displays
> what
> > > byte
> > > > > you received from the graph link software. Then by examinig the
> TI-OS
> > > and
> > > > > see how that would respond you can make your receive program a bit
> > > > complexer
> > > > > as to receive and examine more bytes. And so you continue. And
then
> > > > > (theoreticaly) you should be able to find what format your OS-file
> > > should
> > > > > have.
> > > > > ------------
> > > > > Hmm, this sounds a bit to easy maybe, but at least somebody could
> try it
> > > > > out.
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Tijl Coosemans" <tijlc@hotmail.com>
> > > > > To: <assembly-83@lists.ticalc.org>
> > > > > Sent: Monday, July 09, 2001 9:55 PM
> > > > > Subject: [A83] Re: What is the problem with flash writes (in
> general)
> > > > >
> > > > >
> > > > > >
> > > > > > > From: "Hyperbyte" <hyper@hysoft-automation.com>
> > > > > > >
> > > > > > > > > From: "Hyperbyte" <hyper@hysoft-automation.com>
> > > > > > > > >
> > > > > > > > > Simply put, no user-program can do it.
> > > > > > > > >
> > > > > > > > > Explanation:
> > > > > > > > > The flash chip has a "write enabled" line,
> > > > > > > > > only if this line has specific signal, one can write to
the
>
> > > flash
> > > > > > > > >
> > > > > > > > > Now one could simply set this signal, if TI hadn't
prevented
> > > that,
> > > > > > > > > they've somehow made it only possible for certain OS
> Rompages to
> > > > > > > > > set that value.
> > > > > > > > >
> > > > > > > > > (I think it's kinda obsolete now, since TI's released the
> app
> > > > > signing
> > > > > > key,
> > > > > > > > > but I doubt they'll insert _FlashWE and _FlashWD romcalls
in
> new
> > > > > > OS'es)
> > > > > > > > >
> > > > > > > > > You could hardware hack that WE line, but then your
program
> > > > wouldn't
> > > > > > be
> > > > > > > > distributable...
> > > > > > > >
> > > > > > > > Or, you can make your own OS, I mean TI-OS, which implements
a
> > > > routine
> > > > > > that
> > > > > > > > enables writing to flash......
> > > > > > >
> > > > > > > How are you planning on signing that custom 'TI'-OS?
> > > > > > >
> > > > > > > AFAIK, OS'es need to be signed too, and I can't see how TI
would
> be
> > > > > > > as stupid as to sign it's OS'es with the freeware private key.
> > > > > >
> > > > > > It's all theoreticaly of course, but when you attempt to send an
> OS to
> > > > > your
> > > > > > calc, your calc checks if it's a valid OS right? So can't you
> check
> > > that
> > > > > > code and see how that's done? It's also possible that the graph
> link
> > > > > > software checks a few things, but writing your own PC program
that
> > > sends
> > > > > > data and doen't check anything shouldn't be that difficult.
> > > > > >
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