Marketed as the "Total Percussion Sound Module", the R-8M has 3 card slots for SN-R8 PCM expansion cards and one RAM card slot (for an M-256D or M-256E).
It is the rackmount form of the Roland R-8, but without sequencing capabilities and with only 12 notes of polyphony. Since it lacks the "Human" (variation) and "rhythm composer" (sequencing) capabilities of the R-8, a used R-8M costs far less than a used R-8.
Year Released: 1989
Polyphony: 32 notes
User Drumkits: 32
ROM Size: 68 sampled waveforms at 16-bit, 44.1 kHz resolution
Outputs: 8 individual 1/4" outputs
Screen: 16 x 2 character backlit LCD
Power Consumption: 15 watts
Weight: 4.5 kg
Dimensions: 482 mm x 358 mm x 45 mm
Roland R-8M ($150)