I wanted to have this flavor available in sampled form to use with modern virtual instruments. I edited a set of 44,1 kHz samples, using one sample long impulses, looped to match the tune, then mapped them to sfz, so I've got a handy 1-bit, impulse train oscillator. Here's an example of the sound. And here's a look at the waveform, compared to sine.
You can DOWNLOAD it here. There are 61 wav files, one file per note, 44,1 kHz, 8 bit (for compatibility reasons). Included simple maps for sfz and Kontakt 2 (it's just one drag and drop to place them in, so it doesn't really save you any work).