Sadece alt border gitse iyi de senin cihazın çözünürlüğü de 480x234 ise alttan bir 9 piksel (24. satırın son pikseli ve 25. satır) gitmiş gibi görünüyor.
Visible area of the screen on the monitorDifferent monitors show differently much of the VIC's output. The following figures are valid for PAL.
The left border is 6 chars wide. From these 48 pixels, 2 are invisible because of the white HSYNC burst stripe. The right border is 4.5 chars wide, which is 36 pixels. Thus, the visible area is 46 + 320 + 36 = 402 pixels wide.
The earliest line known to be displayed by any monitor is $08. This makes 43 lines of upper border. The last line known to be displayed is $12c, which makes 49 lines of lower border. Thus, the visible area is 43 + 200 + 49 = 292 pixels high.
Remember that when using sprites in the upper border, line $08 corresponds to sprite y-position $07 (!). So if you want to cover the whole visible area, you should start with sprite(s) at y-position $07 and then work your way down 292 lines.
Overall, this makes a visible area of 402 by 292 pixels.

Kaynak:
https://codebase64.org/doku.php?id=base:visible_areaVisible Area
Different monitors show differently much of the VIC's output. The following figures give the maximum possible numbers:
PAL-B
The left border is 6 chars wide. From these 48 pixels, 2 are invisible because of the white HSYNC burst stripe.
The right border is 4,5 chars wide, which is 36 pixels.
Thus, the visible area is 46 + 320 + 36 = 402 pixels wide.
The earliest line known to be displayed by any monitor is $08. This makes 43 lines of upper border.
The last line known to be displayed is $12c, which makes 49 lines of lower border.
Thus, the visible area is 43 + 200 + 49 = 292 pixels high.
Overall, this makes a maximum visible area of 402 by 292 pixels.
Kaynak:
http://hitmen.c02.at/temp/palstuff/