Commodore 64: US Gold Tape loader

@DrWatson

Published in 

C64 tape formats

 · 19 May 2021

US GOLD TAPE

Found on...

• 720 Degrees
• Bionic Commando
• California Games
• Choplifter
• Crystal Castles
• Gauntlet
• Impossible Mission 2
• Outrun
• Rolling Thunder
• Solomons Key
• Thunderblade
• Trailblazer
• Trailblazer 2
• Turbo Outrun
• World Games
• etc..

 Threshold : $2D ($168 clock cycles). 
 Bit 0 : $25  
 Bit 1 : $3F  
 Endianess : MSbF  

 Pilot byte : $20 (usually *64) 
 Sync byte  : $FF  
 

Then...

16 bytes : Filename
2 bytes : Start Address (LSBF)
2 bytes : End Address (LSBF)
n bytes : Data
1 byte : Checksum (XOR of all data bytes)