C64 Ultimate Wiki

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====== What are you talking about? ======
Every subgroup has its own terms people //in the know// expect everyone to know. - Everyone knows that ... right? 

In the wiki is a function active to show a short explanation for certain terms, like what you get when you write C64. - To modify or add those contact [[Walter]].

This page is to try to give some information about terminology used in the Commodore and retro computer community.

===== File formats =====

  * **TAP** — Raw Tape Image
    * A byte‑accurate recording of the actual magnetic pulses on a Commodore cassette tape.
  * **PRG** — Single Program File
    * A raw C64 program as it appears in RAM, with a 2‑byte load address at the start.
    * Key traits:
       * Contains one program or data block.
       * Loads instantly in emulators or SD2IEC.
  * **D64** — Disk Image (1541 floppy)
    * What it is:
      * A full 170 KB image of a 5.25" 1541 disk, including directory, sectors, BAM, and filesystem.
    * Key traits:
      * Can contain multiple PRGs, data files, and custom loaders
  * **G64**
    * Which is a d64 with additional data to represent low level floppy info. Used for disks with disk based copy protection.
  * **CRT** — Cartridge Image (ROM dump) & **T64** — Tape Container (simplified tape image)
    * What it is:
      * A virtual tape file that stores one or more PRGs, but not the real pulse‑timing of a tape.
    * Key traits:
      * Contains a directory of PRGs extracted from a tape.
      * Does not preserve turbo loaders or custom tape protection.
      * Loads much faster than a real tape because it skips the pulse‑level detail.

===== REU =====
A {{c64w>RAM Expansion Unit}} is a hardware device that increases the amount of RAM available to a computer.  The C64U has this functionality build in and can be enabled in the menu.

{{youtube>3c2jhh1f5FE?}} \\
//The 8-Bit GUY explains how the REU works on the classic C64//

===== What is border removal? =====
Border removal exploits VIC-II behavior when $D011 bit 4 is cleared at specific raster lines. This lets demos display sprites and graphics in the border area.