Enigma at 22:17, 28 August 2026

2026-08-28T22:17:48Z

Enigma at 21:18, 28 August 2026

2026-08-28T21:18:49Z

2019-10-27T21:51:52Z

Created page with "Descriptions needs to be done. ==== Pages that refer to this protection ==== {{Special:Whatlinkshere/GMA88}}"

New page

Descriptions needs to be done.

==== Pages that refer to this protection ====

{{Special:Whatlinkshere/GMA88}}

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 == Mechanism ==
-# The drive seeks to '''track 38''' (<code>$26</code>), searches for the
+# The drive seeks to '''track 38''' (<code>$26</code>), searches for the family's standard byte-aligned marker (<code>69 xx xx xx A9</code>, not decoded to the usual 5-bit GCR nibble boundaries), and measures ten raw sync-to-sync pulse-width samples there, folding them into a single byte via the same <code>CMP</code>/<code>ROL</code> technique used throughout the whole GMA family.
-  family's standard byte-aligned marker (<code>69 xx xx xx A9</code>, not
+# The result is sent to the C64 over a raster-line-synced <code>$DD00</code> handshake (via a hijacked <code>GETIN</code> vector) and used as a single repeating-byte XOR key over almost the entire game, decrypted in place in one pass.
-  decoded to the usual 5-bit GCR nibble boundaries), and measures ten raw
+# On any genuine failure — marker not found within the retry budget, or a failed job status — the drive hangs permanently in an infinite self-loop rather than reporting an error the C64 could act on, the same "hang, never produce wrong output" convention used throughout the whole GMA family.
 == The critical disk pattern ==