Commodore 64: BITURBO loader

@DrWatson

Published in 

C64 tape formats

 · 3 years ago

BITURBO BY SC 85

Threshold: $0107 clock cycles (TAP value: $21)
Bit 0 pulse: $1B
Bit 1 pulse: $27
Endianess: MSbF

Pilot byte: $02 (x496)
Sync sequence: $10, $0F, ... $01
1 byte: ignored

Hardcoded inside CBM Header block:

• $0305: Load address (LSB)
• $0317: Load address (MSB)
• $0313: End address (LSB)
• $030C: End address (MSB)

Data

1 byte: XOR checksum

Trailer: bit 0 pulses (x2040 about)