Commodore 64: International Karate Tape loader

@DrWatson

Published in 

C64 tape formats

 · 25 May 2021

Found on

• International Karate

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Threshold : $0168 (360) clock cycles (TAP byte $2C)
Bit 0 : $27
Bit 1 : $3F
Endianess : MSbF
Pilot : Bit 1 (*2063)
Sync : Bit 0

Then...

1 byte : File Number (they begin at $01 and increment by 1)
2 bytes : Load Address (LSBF)
2 bytes : End Address (LSBF)
2 bytes : Exe Address (LSBF)
n bytes : Data
1 byte : Checksum (0 XOR all data bytes)

Notes :

• If Exe Address is $0000 then nothing is executed, only the last file has a non-zero value
• 7 unused pulses are written after the Checkbytes on my tape, they are safe to remove