Commodore 64: Anirog Tape loader

@DrWatson

Published in 

C64 tape formats

 · 31 May 2021

Found on...

• Skramble
• Attack of the Mutant Camels
• Revenge of the Mutant Camels
• Cybotron
• Zodiac
• ...

Formatting is very similar to 'Turbotape 250', but does not use header files or (unfortunately) checksums.

-----------------

Threshold = $107 (263) clock cycles (TAP byte = $20).
Bit 0 : $19
Bit 1 : $28
Endianess : MSbF
Pilot byte : $02 (*247)
Sync : $09 down to $01

(Note: Pilot + Sync sequence = 256 bytes.)

Then...

1 byte : $01 (if $00 loader re-seeks Pilot and Sync train).
2 bytes : Load address (LSBF)
2 bytes : End address (LSBF).
n bytes : Data

Notes :
This is the same turbotape format used (partially) on 'Zoids' loader.
Tapes using this format frequently contain multiple copies of the game.