User:Evilmoo/IDA Pro

Things you need to know going in:

• We will be working on Alternate Reality: The Dungeon
• It ran on the Atari 8-bit
• The Atari 8-bit consisted of the following chips:
  • MOS 6502
  • ANTIC
  • POKEY
  • PIA
  • GTIA
• A detailed memory map can be found here: [1]
• We will use the following tools in our work:
  • make
  • cc65
  • git
  • IDA Pro
  • some various Unix commands to process data
• Some information about Atari 8-bit disk images: [2]

Our source information comes from here: [3]

We obtain the binaries by clicking on the "DOWNLOAD" link.

The .ZIP file contents look like this:

Archive:  Alternate_Reality_The_Dungeon.zip
 Length   Method    Size  Ratio   Date   Time   CRC-32    Name
--------  ------  ------- -----   ----   ----   ------    ----
   92176  Defl:N    65207  29%  10-03-04 16:56  dc960629  Alternate Reality - The Dungeon _ disk 2 _ side B.atr
   92176  Defl:N    54159  41%  10-03-04 16:55  2afec574  Alternate Reality - The Dungeon _ disk 2 _ side A.atr
   92176  Defl:N      348 100%  10-03-04 16:11  58f056d5  Alternate Reality - The Dungeon _ character disk.atr
   92176  Defl:N    56987  38%  10-03-04 16:57  20c4fd02  Alternate Reality - The Dungeon _ disk 3 _ side A.atr
   92176  Defl:N    80533  13%  10-03-04 16:57  7c55f7c4  Alternate Reality - The Dungeon _ disk 3 _ side B.atr
   92176  Defl:N    57507  38%  10-03-04 16:54  b605610d  Alternate Reality - The Dungeon _ disk 1.atr
--------          -------  ---                            -------
  553056           314741  43%                            6 files

We will concentrate on Disk 1 to begin with, since it is the boot disk. It is an .ATR file, so we need to remove the first 16 bytes to convert it into a raw image:

$ dd if="Alternate Reality - The Dungeon _ disk 1.atr" of=ar11.img bs=16 skip=1