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Roland ProMars Compuphonic

The ProMars was introduced in 1979 as a monophonic version of the Jupiter 4. It featured two oscillators per voice and two filters; a simple high-pass with a cutoff frequency between 40Hz and 5kHz and a low-pass filter from the 20Hz to 20kHz range with LFO modulation & ADSR.

The ProMars was the first synth to include microprocessor control. Using a primitive  processor to control the analog VCOs, VCAs, and VCFs.

Roland ProMars Demo

Roland Promars Compuphonic MRS-2 synthesizer – HD demo
Some Roland Promars patch. From 9:54 minutes a comparison side by side between the Promars and the Minimoog.

Roland Promars Compuphonic MRS-2 synthesizer - HD demo

Roland SYSTEM-8 Synthesizer w/ Promars & SH-2 Plug-outs

$1,045.00
End Date: Sunday Jul-16-2017 7:49:05 PDT
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Roland Promars MRS-2 Compuphonic synthesizer  Full working

$1,460.00
End Date: Wednesday Jul-5-2017 22:14:32 PDT
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Roland PROMARS MRS-2 Vintage Synthesizer in Great Condition

$1,980.00
End Date: Monday Jul-10-2017 2:09:21 PDT
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Roland ProMars Softsynth

The PROMARS PLUG-OUT Software Synthesizer is a complete reproduction of the rare and powerful PROMARS synthesizer first released in 1979. With two detunable VCOs and two sub-oscillators per voice, the PROMARS is easily one of the most deep and rich sounding monosynths ever created. Designed for SYSTEM-1 as well as Mac and PC hosts, the new PROMARS uses Analog Circuit Behavior to faithfully recreate every detail of the incredibly warm, dense sound of the original

More info here