Re: TI-H: 512k RAM


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Re: TI-H: 512k RAM




Kaus wrote:
> 
> additionally, there are hardware problems.  the system's memory map is
> already full. 
[..]

In the ti89 though, it should work.
here is a cut from 89hw.txt by Johan Borg (to be found at my website
http://alh.dhs.org/ti89/)

---------
On the TI-89, memory is mapped:
000000-1FFFFF : RAM (000000-03ffff used)
200000-3FFFFF : (flash) ROM
400000-5FFFFF : Nothing (pin 17, ~CS to ROM at $400000, used in the ti-92...)
600000-60001F : Memory mapped I/O (lower 5 bits)
C00000-Dfffff : Nothing, (pin 16, ~CS active.... no memory implemented there 
                                in any calc yet, i think...)              
---------

So, in the ti89 you have two memoryareas that is free, and even has a chip
select pin ready and all.

A question.. what is on 400000-5FFFFF in the ti92?
another question..  could'nt it be possible that C00000-Dfffff is free (and
maybe even has a chip select) in the ti92?
hmm.. possible that $400000 isn't any good for RAM..  has to ask Johan about
that. Maybe with some controlling logic on a port, or useing the free pin 100 on
the ti89, controllable via port $600000.

//Olle


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