Commodore 64: HiTec Tape loader

@DrWatson

Published in 

C64 tape formats

 · 3 years ago

Found on...

• Chevy Chase
• Crystal Kingdom Dizzy
• Road Runner & Wile E Coyote
• Top Cat in Beverly Hills Cats
• Turbo the Tortoise
• Yogi's Great Escape

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Threshold : $17E (382) clock cycles (TAP byte = $2F).
Bit 0 : $25
Bit 1 : $45
Endianess : MSbF
Pilot : $AA (*256)
Sync : $A0

1 byte : Block Number (they start at 0)
1 byte : VIC screen hide/show, value is $00 or $10, ($10 = show)
2 bytes : Load Address (low, high)
2 bytes : End Address (low, high).
2 bytes : Execution Address (if $0000 then no action taken)
n bytes : Data.
1 byte : Checksum (0 xor all n data bytes)

Note :
The same format can be found in 'Virgin Tape' but with a lower threshold.