Commodore 64: Snakeload V5.0 loader

@DrWatson

Published in 

C64 tape formats

 · 3 years ago

Found on..

• Soldier of Light
• Shinobi
• Saint Dragon
• Ninja Warriors
• Narc

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The following text was found in "Ninja Warriors"' CBM Data file:
SNAKELOAD V5.0 (C) STEVE SNAKE, KML 1987. THIS IS NOT SUPPOSED TO BE PROTECTED SO DON'T THINK YOU ARE GOOD FOR CRACKING IT !!!KYLIE RULES!

2 pulsewidth sets have been found so far...

T1...

• Bit 0 : $3F
• Bit 1 : $5F

T2...

• Bit 0 : $60
• Bit 1 : $A0

Endianess: MSbF

• Pilot : Bit 0 (*2063)
• Sync : Bit 1

Then...

• 5 bytes: 65 69 6C 79 4B: "eilyK" - Identifier (read backwards: "Kylie")
• 1 byte : File ID
• 2 bytes : Load address (LSBF)
• 2 bytes : End address (LSBF)
• n bytes : Data
• 1 byte : Checksum (addition of all Data bytes & $FF)

Trailer:
Bit 0 pulses.