# 83Plus:OS:OS 2.53MP Changes

IMPORTANT NOTE: The 2.53MP is a leaked beta. Please do not distribute it to people by calculator until TI makes the official release, slated for February 15. Use at your own risk.

I have recently realized that there is already an OS versions page. The two will be merged when the official release is made.

## Contents

• Math Print is TI's own pretty printing
• New menu Alpha+F1-F4 for use with Math Print
• In MP, press up to scroll through previous entries, which allows basic copy and paste.
• The Table screen now has an option for <delta>Tbl, which allows you to set the interval between the X entries of the table.
• New ZOptions under Zoom

## New Tokens

• AUTO Answer -- basic [EF 3B]
• CLASSIC -- basic [EF 38]
• DEC Answer -- basic [EF 3C]
• >F<>D -- swap between fraction and decimal [EF 31]
• FRAC Answer -- basic [EF 3D]
• logBASE( -- log to any base, logBASE(x,base [EF 34]
• MATHPRINT -- basic [EF 37]
• n/d - normal fraction, numerator n/d denominator [EF 2E]
• >n/d<>Un/D -- swap between improper and proper fractions in MP [EF 30]
• randIntNoRep( -- gives a list of random integers, with dimension high-low+1 randIntNoRep(low,high [EF 35]
• remainder( -- essentially modulo, x % y, remainder(x,y [EF 32]
• summation <sigma>( -- <sigma>(expression,variable,start,end [EF 33]
• Un/d -- mixed number, whole Un/d numerator n/d denominator [EF 2F]
• ZFrac1/2, -- delta-x,y = 1/2, graph centered [EF 18]
• ZFrac1/3, -- delta-x,y = 1/3, graph centered [EF 19]
• ZFrac1/4, -- delta-x,y = 1/4, graph centered [EF 1A]
• ZFrac1/5, -- delta-x,y = 1/5, graph centered [EF 1B]
• ZFrac1/8, -- delta-x,y = 1/8, graph centered [EF 1C]
• ZFrac1/10, -- delta-x,y = 1/10, graph centered [EF 1D]
• fraction related tokens
• _, EF2F, not the same as printing _. New font codepoint 0F5h.
• /, EF2E, not the same as division /. New font codepoint 0F6h.
• box, EF1E. New font codepoint 0F7h.

## Flags

• 5, (iy+44h) controls math print. You should clear the screen if you change this flag.
• 0, (iy+48h) controls the fraction mode
• bits 1 and 4 of (iy+47h) are related to when the OS decides to format an answer as a fraction
• 4, (iy+45h): set this to disable the message about shortcut menus from Press-to-Test. Not affected by Reset Defaults, though Math Print is.

## Bcalls

• 5410 -- alpha menu reminder pop up

## Memory

• RAM page 3, \$977E-\$9A7D -- previous entries. Destroying this causes crashes.
• RAM page 3, \$9A7E-\$9D7D -- homescreen graph buffer. Zero after destroying to prevent flicker.

# Compatibility Issues

• Programs using the homescreen may be very broken. Users should disable Math Print before running them, and programs should clear the screen first thing.
• Programs that encounter an error on the graphscreen may end up with the graphscreen contents in the homescreen buffer
• In Omnicalc, parenthesis assistant does not work properly. (Display error)
• In Omnicalc's entries menu: Using the entries menu without MP symbols has some display issues, and when selecting an entry, it crashes.
• In Omnicalc's entries menu: With mathprint symbols in the entries log, there are serious display issues accompanied with a dramatic crash.
• Omnicalc's partial line clearing (always enabled) crashes or glitches when you try to use it in MP.
• Calcutil will not run at all correctly and will crash your calculator when you turn it off and back on.
• ld a,1 \ ld (appInfo+2),a \ bcall(\$50CB) no longer unlocks the flash ROM.

# Known Performance Issues

• Disp and Output may be up to 4x slower than on previous OS version when MathPrint is enabled (see TI-84+ OS v2.53 Leaked)
• When MathPrint is enabled, when you go to the "Y=" menu to type a function, it's displaying slowly the Y1, Y2, Y3, Y4 etc.

# Bugs

This is for bugs or strange functionality. Note the above "Compatibility Issues" section; use that for issues with third-party software.

• MathPrint Bug : When a list is displayed as a result, you can't take it back for you new entry : selecting it and pressing enter doesn't work
• Math Print can't handle overly complex expressions. If your expression is starting to require vertical scrolling, expect to encounter the old out-of-memory checkered box soon. Try to recall this expression and it won't get fully mathprintified.