A92: Flash ROM
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A92: Flash ROM
Hello
I was thinking about a thing which could be a
great way of increasing the archive memory on the TI-92 Plus.
Since 1995, Ti released the TI-92 with the ROM
in a cartridge, who was put in the place the Plus module is now. This was called
"external ROM". That was to make it possible to easily change the ROM
in the future.
But later, TI realized that the Flash technology
could be a better way of updating ROM, and so they stopped putting ROM in a
Module and soldered it directly in the "motherboard" of the
calculator. These ROMs were called "1.11 internal" and "1.12
internal".
Now, the Plus module is there, with a totally
new ROM support.
But, in the case of the calculators, who used to have the
internal 1.11 or 1.12 rom, and now have the Plus module, like mine, there is
actually 2 ROM, one totally unused.
I think they must be lots of common points on both rom. For
example, some Plus apps are exactly like the former version (for example,
data/matrix editor, text editor, y=, table, etc...). So, I think both ROM have a
lot of data in common, and consequently in duplicate.
In this group, some of you found out that the former ROM can
still be accessed :
> $200000-$2fffff: OLD TI92 ROM
So, in the Flash ROM, we could replace the parts which are in
duplicate by a single reference to the place in the old ROM where the
corresponding data. I think that if I'm right, we could earn about 500 ko of
archive memory.
What do you think of that ?
Nicolas
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