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I was puzzled why some cassettes like Ferzerx wouldn't load. I ended up writing the world's worst cassette parser, dumping samples from audacity and seeing if I could parse raw samples with plain old lua.

Since the sample rate is 11025, if I count the number of samples that are above zero, less than 4 should be a zero and greater than that should be a 1 with a single zero ending the all 1's intro.


What I discovered with ferzerx is that it is picking up a stray zero within the lead-in (which should be all ones). If I cut the first 7 seconds of the audio in audacity, it loads perfectly.




Going to try this technique with some other cassettes that won't load.

That may explain why it would load if you delayed pressing enter for a few seconds after starting a CLOAD.

I would always hit enter first, then hit F2 to start up the cassette, so I was always starting from the beginning.

Managed to work-around: it's hard fixing in code a r/w to the DDC connection at $e2, which was also NOP-ed by the southbridge implementations for no reason. S3 configuration strapping itself should really be card responsibility, but that's for another day ...

https://forums.bannister.org/ubbthreads.php?ubb=showflat&Number=124324#Post124324

PC-88VA time: a billion of video features later ...











... and still short of another billion video features, and completely puzzled by the Olteus text display (there's no register available that makes that layer to "bump" a 4bpp to 8bpp, color DAC shenanigans?).

Anyway, 25fa1ff89a95cde45eda378e177806ef80dffa04 makes it recursively discover device types for slot options.