Re: TI-H: In desperate need of help
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jmacha wrote:
>
> On Sun, 5 Nov 1995, becker wrote:
>
> > > couple of other questions too.. the center chip does not communicate
> > > directly to the LCD board either.. any info would be appreciated.
> > I'm so proud I figured this out....
> > The chip on the far right IS the Z80, because it has 80 pins and the
> > normal (non-toshiba version) Z80's 40 pins are each used twice(this was
> > done for easier layout on the board because some of the pins do send and
> > recieve functions). I also know this because the far right chip is the
> > only one that outputs 15 of its pins to the LCD board. The ram chip is
> > in the middle and the rom is on the left.
> >
> > I also think I figured out how to(with a mess of modifications) disable
> > the ROM through a shell, and enable the processor to be upgraded by
> > something like the Z8002. <---that sucker is 16-bit!! I will soon be
> > checking compatability for the Zilogs 32-bit microprocessors.
> >
> > I guess I was wrong about whoever I yelled about that RF link. WERE
> > LUNATICS AND WE WILL TRY TO DO TO OUR CALCULATORS WHATEVER POPS INTO OUR
> > INSANE LITTLE HEADS!!! HEEEEHEEEEEEE!!
> >
> > By the way, does anybody know who I can call about getting my own rom
> > chip made for a new processor and memory upgrade? That's pretty crazy,
> > but I need some solid-state memory to my own specifications.
> >
> > -Chris
> >
> I'm glad you cleared this mess up, can you send me the code to
> disable the ROM, though I sure would like a good look at it.. I was
> thinking of a way to steal the addx. and data lines from the calc's bus
> and add it to a circuit to expand the memory with it's own manager(since
> it can only address 64k), kinda like EMS, paging..
> -Alex
I haven't written code to disable ROM... that isn't important, ZShell
already does that for us. What's hard is keeping a shell (which is
compatible with both processors) running when you switch processors.
(the ROM won't recognise some god-forsaken 64-bit chip, in fact, the ROM
would probably drop a load in it's pants.) One thing we could do is to
have a shutdown routine which will power up the calculator in the new
processor mode. Then, we could try to find the raw, machine-code specs
for TI-basic, and send a modified version to the calculator for the new
processor. Neat, huh?
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