Re: TI-H: 512k RAM
[Prev][Next][Index][Thread]
Re: TI-H: 512k RAM
You can add an extra 128kbyte to the 92 and it -will- recognize it as extra
memory...
(It will say 256k free)
Grant
>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
Follow-Ups:
References: