It seems that the data doesn't match... I wondered if this VOL2 of the MSX version, but after checking they look completely different.
I found some coincidences. It seems that GZ tape is actually VOL2 from Portopia, but chopped/mixed/corrupted.
It seems that the data doesn't match... I wondered if this VOL2 of the MSX version, but after checking they look completely different.
I found some coincidences. It seems that GZ tape is actually VOL2 from Portopia, but chopped/mixed/corrupted.
Haha, you are right, I copied the wrong VOL2 mention. Teaches me to do forensics after midnight.
Never the less, this low amount of matches, not to mention the dozens of bytes missing (and you decoded the file manually at first, so I'm guessing you didn't skip "bad" bytes), the chance it's actually different data, in the same format?
For example, the string: 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8E appears twice at the start of file in Portopia, but just once in the GZ tape. These first set of values seem to be used to block file listing, using just one creates the situation where I was able to list and run contents after a reset operation (this doesn't clean the memory). And like the removal of the PC-6001 from the VOL1 REM, it sounds intentional, but unexplained.
For what's worth, this is the start of the list:
(Yes, you are seeing wrong - it says LOGIN but it's actually the math instruction LOG + the instruction INPUT, not the string)
This code "runs", but basically manages to pass the first INPUT, then either crashes on the next or following line as it enters gibberish land.
I was just surprised it ran at all, and people did ask me to try all sort of things and let them know 
But I don't really see how the "BASIC code" present in the GZ tape can currently be shaped into anything workable.
Kojima is a bit of a collector. I'm sure he used his own original Portopia tape (what would explain the poor condition / corruption of the audio).
It's much better suited as an easter egg.
