Re: Memory Problems

Subject: Re: Memory Problems
From: Hugh F. Tong <Zenon@therockies.com>
Date: Sun, 8 Sep 1996 08:22:25 -0600
In-Reply-To: <Memory Problems>

Bernard Domroy wrote:
>
> This can be done.  But you need to get someone to rewrite the portion of the
> ROM that limits the memory.  The people who wrote z-shell probably have
> disassembled the ROM and know what needs to be changed.
>
> domroy
>
> At 09:59 9/7/96 -0600, you wrote:
> >Bernard Domroy wrote:
> >>
> >> You don't get it.  ROM is read only memory.  You would have to purchase a
> >> new ROM chip which had been modified, or you would have to replace the ROM
> >> with EPROM, erasable programmable ROM.  This is not a simple task.
> >>
> >> domroy
> >>
> >> At 08:31 9/7/96 -0600, you wrote:
> >> >P. Kolbus wrote:
> >> >>
> >> >> The ROM was only designed to address 32k of RAM...  If you want to write a
> >> >> new ROM for your calculator, go ahead... =)
> >> >
> >> >First off, I don't know how to write ROM, so if there is anyone out
> >> >there who would be generous enough to benefit all TI-85 users, please
> >> >write a user-friendly ROM upgrade for us all!!  8)
> >> >
> >> >Secondly, even after the new ROM has been written, you would still need
> >> >to change the hardware; add memory chips and such.  Is there anyway or
> >> >anything that will allow this?
> >> >
> >
> >Then is there any way of purchasing compatible EPROM and transfering the
> >information from the TIROM to the EPROM then inserting the EPROM into
> >the calculator?
> >
Is there anyone generous (and smart like Dan Elbe and Magnus Hagander)
enough to rewrite the ROM for us so that we can continue this
experiment?  And would there be anyone interested in finding out more
about the hardware portion ie. getting the EPROM, the new RAM for the
TI, ect...?

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