Roland Jupiter 8 rack-MKS-80 Super Jupiter Synthesizer Rev 5

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via this auction

Consensus has it the MKS-80 is actually somewhere between the Roland Jupiter-6 and Jupiter-8. More on that below. First the auction description:

"This is a revision 5 unit that has been tested and is working properly and has been for many years. Used in a home studio to make karaoke tracks. Original manual and cartridge are included along with a print out of the sounds on the cartridge."

Regarding the Jupiter-6 vs Jupiter-8: Here are the chips according to Synth Techs CEM page (I can't clearly make out the SN for this MKS-80 so who knows)

Jupiter 6
12 CEM3340 VCO
6 CEM3360 Dual VCA

MKS-80 to Serial #511800
8 CEM3340 VCO
4 CEM3360 DUal VCA

MKS-80 Serial #511800 up
8 IR-3R03 Roland VCO
4 CEM3360 Dual VCA
4 IR-3R05 Roland VCF/VCA
And via sequencer.de's wiki: "Jupiter 8 / MKS-80 Filter? Curtis? Roland? Thats a common mistake. But there is NO CEM filters in any of the MKS revisions. The CEM rev. has only CEM VCO and VCA even the ju8 has no curtis filters.. same for the ju6.. Both revisions uses 2 CEM3360 _DUAL_ VCA per voiceboard for Crossmodulation- The older revision usesr IR309 filter like in JP4, JP8, Juno60 etc. The newer MKS uses IR305 which is both VCF and VCA. like in Juno1/2, JX-10 etc. So it is right as follows (I will remove the wrong ones soon): MKS-80 (racked jupiter8) MKS80 used 8 x IR3RO5 ..to Serial <#511800 WRONG (called the curtis / roland myth:): 8 CEM3340 VCO 4 CEM3360 DUal VCA Should be: 16 CEM3340 VCO 8 CEM3360 Dual VCA 12 IR-3R09 VCF MKS80 serial >511800 WRONG (called the curtis / roland myth:): MKS-80 Serial #511800 up (later models) 8 IR-3R03 Roland VCO 4 CEM3360 Dual VCA 4 IR-3R05 Roland VCF/VCA Should be: 16 IR-3R03 Roland VCO 4 CEM3360 Dual VCA 8 IR-3R05 VCF/VCA "

If this doesn't completely make sense to you, and you still aren't sure what the MKS-80 is closest to, you are not alone. :)