Is my system hacked??

[shanx]

I am using fedora 16(kde)
when I lock the screen, a very obsolete black screen saver( just like old antenna TVs), resolutions is 3/4 of my screen, its head is 'APPLE ][' in bold..........and some code is constanly wriiten and executed like:
]1 REM APPLE ][ SCREEN SAVER //head APPLE ][ gets removed
]10 GR
]100 COLOR=RND(1)*16
.....
.... // random colors appear for few seconds
next:
]10 HGR 2
]20 FOR Y=0 TO 190 STEP 2
]30 HCOLOR=4 :REM BLACK
]40 HPLOT 0,191-Y TO 279,Y
]60 HCOLOR=7 : REM WHITE
....
.... // a pattern is made

point to notice is that, while been written, mistake is done and backspace is used to correct it....and sometimes syantax error comes up and then he/she/whatever writes the previous line again
as soon as press a key, fedora lets it be typed in password box for login, and i am back in my session.........also shutdown is taking more than 2 minutes

so, AM I HACKED??.................sorry for anything foolish...i am a total noob