I may have found a glitch in OS 2.55MP.

Steps:
1. enter any one-digit number
2. use the fraction (bold slash) command (ALPHA + Y=)
3. enter another one-digit number to create a fraction.
4. Press ENTER.
The top and bottom halves of the screen will switch (turn off calculator to fix)

I cleared the RAM, and the problem persists. I was wondering if anyone else successfully performed the glitch/bug/easter egg.

I've experienced this bug before. I suspect it has something to do with DCS, but I don't know. If it indeed is a true bug then we might get a DCS update.

I'll try on a clean version and report back.

Hmm doesnt work for me

APotato, you'll need DCS.

Some programs (notably, some versions of Axe) use a flash unlock exploit that corrupts the OS. On 2.55, it results in a fraction glitch. If you re-install your OS, the problem should disappear.

I completely forgot about this. It was fixed in Axe 1.2.0, so if you use Axe, I'd advise upgrading to the latest version of Axe (1.2.2) and then resending the OS.

I have DCS8.1
It may be because I have a PCSE

This glitch will probably not work on a TI-84+CSE.

I had this happen to me before. I read somewhere that this is a known glitch due to the use of MathPrint on the OS.

JosJuice is completely correct. I made a patch a while back that fixes this "glitch". This patch will invalidate your OS, but, if you are experiencing the glitch, then your OS is already invalid.

(The patch is actually sort of an immunization that makes the OS corruption from the universal exploit not have any effect.)

Also, I can't figure out the URL tags, so here a link to the patch http://www.omnimaga.org/other-calculator-discussion-and-news/ti-8384-os-glitches-compilation-thread-%28all-oses%29/msg261410/#msg261410