[9.17] Speed up the keyboard
(This tip is Francesco's submission to ticalc.org. I haven't tried it yet, so proceed at your own risk. I
have made very minor editing changes. If you make even the most trivial mistake with this procedure,
you may well completely hang up your calculator. You've been warned.)
Speed up the keyboard TI-89 / TI-92 Plus; mini how-to
By Francesco Orabona
4/17/2002
Introduction
There are some TSR programs that speed up the keyboard of TI89/TI92+, but they have some
problems:
! they have some bugs
! sometimes are old and not fully compatible with HW2
! they always need HW2Patch or h220xtsr, even if there isn't written in their docs!
! they need a little amount of memory
! some kernels will uninstall them without freeing the memory used.
For all these reasons I have thought to follow an alternative and, IMHO, simpler way: to change the
values directly in the ROM! The steps I have followed are very simple.
The steps
Launch your favorite hex editor (for example I have used UltraEdit).
Open the ROM file *.89u/*.9xu. Go to the address
TI-89 2.05: 2CC9A and 2CC9B
TI-89 2.04: 3330D and 3330E
TI-89 2.03: 94153 and 94154
TI-89 2.01: 96CD6 and 96CD7
TI-92 Plus 2.05: 2CA80 and 2CA81
TI-92 Pluse 2.01: 965DC and 965DD
The numbers 01 and 50 should be at these addresses. Change 01 to 00 and 50 to 64.
Go to the address
TI-89 2.05: 2CCBD
TI-89 2.04: 33330
TI-89 2.03: 94176
TI-89 2.01: 96CF9
TI-92 Plus 2.05: 2CAA3
TI-92 Plus 2.01: 965FF
The number 24 should be at this address. Change it to 14. Save the file.
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