Long gone.
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Cool find! The OS is available on Roland’s site. I’m trying to paste the link but that functionality appears to have broken with the site update???
I can make the disk for you and drop it in the mail if you need.
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PM me your mailing address. I should be able to get it done this weekend.
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I had all Roland MCs after MC303 (my first one), except MC808.
Now I think the only one I want is MC 202 ! 
I have a 202 but I’m not about to post that to you.
I’ll be interested to see bradleyallen’s opinion of the MC-50. Juan Atkins is a fairly well known user and he was using it even after DAWs had become commonplace.
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Lucky you. I miss SuperMRC!
Had it on a MC300 then a mki MC50. The 50 is much faster for edits because it doesn’t have to keep accessing the disk.
It had this cute version of automation where you go up and down a midi keyboard to overwrite the velocities of recorded notes. And other cool things that come back to me now and then. Lots of channels can go on each track. Each track can be routed to either midi out. You can extract and merge events by type and channel, input any sysex…
It could record sysex so well that I could record and playback mouse movements on the S330 sampler - like drawing waveforms and other non midi stuff
One downside is that looped sections of the sequence would have a tiny delay when repeating - it wasn’t made for that but it was still nice to do, using the track buttons as mutes. It had a drum machine style input as well that was loop based but can’t remember if that had the delay
Try to get hold of a manual! My big stack of photocopies is long gone
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So
Nice
Wow. They do look really clean. Those MC-500 keys have a tendency to yellow when exposed to cigarette smoke. You may have a few smoke free units there. I always liked that the 707 can be used for din sync even if you don’t use its sounds.
Don’t you thing the MC50 inspired Elektron designers for the Digitack ?
I used to record the outgoing midi using the edit wheel to scroll through sequences instead of pressing play, for loping rhythms
Bet that tip’s not in the videos @sezare !
I won’t watch them because too much nostalgia and longing for the space and time required argh
But yeah - a lot of p-lock equivalents going on when you program like that (including Program changes, Elektron!)
PB max up and max down on alternating resolution step then play with tempo to get weird timbres from standard GM sources.
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@bradleyallen, so it turns out there is more to this than I would have thought, and my floppy drive is dead. I’m trying to source a working floppy drive so I can write these images for you.
You can read a little about this here. I swear the URL isn’t shady, despite the name of the domain. 
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Might be able to help writing out those images to floppy disk. Let me know which one you need and where to send it to. 
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MC-500 OS files are attached. The second attachment, the sdisk tool, outputs the image in the format understood by the MC-500.
mrc300500.zip (148.3 KB)
sdisk.zip (18.3 KB)
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