Commodore 64: Ocean-Imagine Tape F1-F3 loader
OCEAN-IMAGINE TAPE
Can be found on...
- Green Beret
- Miami Vice
- Mikie
- Parallax
- Ping-Pong
- Rambo
- Arkanoid,
- The Great Escape
- Head Over Heels
- Hypersports
- Mutants
- Short Circuit
- Top Gun
- etc..
There are 3 different Ocean-Imagine loaders found so far. The differences are very small, so almost the same decoding can be used.
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Threshold : $1E0 (480) clock cycles (TAP byte = $3B).
Bit 0 : $24
Bit 1 : $56
Endianess : LSbF
Pilot : Bit 0 (*3000+)
Sync : Bit 1
Flag : $AA (only for types 2 and 3)
Data is structured from sub-blocks, each sub-block is 256 bytes long and has 2 bytes of header info.
1 byte : If it is $01 then loader writes $00 to address $0001.
1 byte : Load address (high byte only).
256 bytes : Data.
Notes:
The END of loading is signalled by the load address byte being $00 for types 1 & 2, for type 3 the end of the loading signalled by this byte being $02.
Types 1 & 2 usually have some trailing tone present (bit 0's). (which is why reading a $00 byte at load address can indicate end of loading for these types).
The format is VERY similar to "Novaload Special".
