S.Elliott's blog

Some synchronous nibble captures

This blogpost is a quick data dump of raw Disk II data, captured synchronously at intervals of exactly 8 CPU cycles.

Picture 1: Synchronous capture of 10-bit sync nibbles and 8-bit address-mark nibbles

WIP: Tape Port Test patterns

Synopsis: an information-capture for work-in-progress

The Apple cassette save routines use the Y register to determine the pulse-width between signal edges, and there are seven distinct values for the Y parameter depending upon the context and state of the save routine.  For the purposes of studying the cassette routines, I named each parameter for its default value and tested their limits:

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Ultima V MIDI with hidden arrangements

For preservation:

A collection of MIDI files extracted from Ultima V in 1995, copied through a MIDI cable to a Roland SCC-1, saved for decades on a 3½" floppy disk, reproduced here on a GS-compatible Roland MT-120.

A full performance is recorded here, and on YouTube.

Artifacts hidden inside the MIDI data reveal hidden arrangements and sound effects that were not reproduced during game play -- including percussion and sound fx that were probably reproducible only on the original composer's equipment.

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