It seems RYK made a new sequencer module for the Roland System 100m a few years back. Each stage has gate mode and count switches to set the type of note [mute, single, repeat, long], and the length or repeat of the note [1-8].
The MKII version also features programmable portamento, step subdivision, and a "fixed-length" sequence mode.
I wonder if anyone else has made any new modules for the System 100m? And if so, did they pay such close attention to replicating the original design as the RYK sequencer did?