You can find them on Reverb here.
Don't miss the video here.
Update: some pics and details captured. I made the mistake of trying to capture them all and then realized how many were listed. :) I ended up switching to the more esoteric models. Quite a few have never been featured here on MATRIXSYNTH before. What's a little bit interesting, is only two new labels were needed, one for Domino and one for Side-Kick-Er. All other brands have been featured before. See the labels at the bottom of this post. Side note: Blogger limits the number of characters to 200 for labels, so I wasn't able to capture them all for this post. You can always search for the brand names featured for more. I assume most do this anyway. The labels are more for maintenance and for finding posts that may not feature brand names in descriptions.Pictured:
Realistic Concertmate Electronic Accompanist-Metronome
"Fully analog rhythmic companion utilizing 5 beat buttons to combine how you wish. Features metronome, speaker and line out, and tempo control.
Serial: 42-2103. Works with no issue."
Shin-ei Companion 4 In The Floor Percussion Combo
"4 in the Floor Percussion Combo is a rare hand and/or foot drum synth produced by the Japanese company Shin-Ei in the late 1960s. As the name might give away – it has four static sounds: Bassdrum, Tom-tom, Claves and Snare. The snare sound features a roll function with variable speed. This machine has some great analog sounds and is really fun to play.
Serial: 633. Only bass drum and tom triggers work. Clave creates a constant tone. Sold As-Is."
Korg MiniPops SR-120 SN 790567
Roland CR-5000 CompuRhythm SN 398292
Kay R-12 Rhythmer
"This 1970s Kay R-12 Rhythmer is every vintage collectors dream. Contains ten different rhythms, with fully adjustable volume and tempo. Contains a 1/4 inch out so can run into most gear. Serial: 1190. Works without issue."
Nomad Time Tuner Owned By Moby
Whippany Electronics RM-20 Rhythm Master SN 9236
"This machine is the Whippany "RM-20", similar to the stand-alone Whippany "Rhythm Master" unit. They share the same "Rhythm Master" name & have the same 10 beat buttons. While the stand-alone version was portable, the RM-20 was usually found mounted to organs under the keyboard. 
Most of the beats are full with good sustaining hats, except for the cool & completely sparse Western beats (single & any 2-button combo w/ "West" in the title). But the goofiest thing about this one is the Latin beats. Disregard their titles because they sound nothing rhythmically like they should! It's a very '80's sounding box, conjuring up memories of Flock Of Seagulls, "Sex Dwarf" era Soft Cell and Prince's Erotic City (check out the "Rhumba_Foxtrot" combo).
Serial: 9236. Non functioning. Sold As-Is."
Wurlitzer Side Man Standing Drum Machine Model 5000
"The Rudolph Wurlitzer Company released an early commercially produced drum machine called the Sideman in 1959. It was an “electro-mechanical” drum machine that offered a choice of 12 electronically generated predefined rhythm patterns with variable tempos. The sound source was a series of vacuum tubes which created 10 preset electronic drum sounds. The drum sounds were ‘sequenced’ by a rotating disc with metal contacts across its face, spaced in a certain pattern to generate parts of a particular rhythm. Combinations of these different sets of rhythms and drum sounds created popular rhythmic patterns of the day, e.g. waltzes, fox trots etc.
These combinations were selected by a rotary knob on the top of the Sideman box. The tempo of the patterns was controlled by a slider that increased the speed of rotation of the disc. The Sideman had a panel of 10 buttons for manually triggering drum sounds, and a remote player to control the machine while playing from an organ keyboard.
The Sideman was housed in a portable wooden cabinet that contained the sound generating circuitry, amplifier and speaker.
Unit doesn't fully work. Turns on and some individual drums trigger. Sequencer doesn't work. Constant noise. Sold As-Is."
Ace Tone Rhythm Ace FR-20 Standing Drum Machine
Univox SRA-75 Drum Machine
"Vintage 1970's Univox SRA-75 Integrated Drum Machine/Amplifier MIJ Machine is in excellent working condition. 20 pre-programmed patterns (foxtrot, rock, swing, etc.) Volume, Tone, Tempo, Cymbal Brush, and Snare Pattern controls Guitar input and 1/4" pedal control output On/Off switches for bass drum, snare drum, and claves
Textured olive grill cloth Some chipping in wood paneling on corners Unique vintage tones with a built-in amplifier!
Serial: 720281. Works without issue."
Olson X-81 Rhythm Instrument
"The X-81 Rhythm Instrument is an analog drum machine with 10 preset patterns and controls over Volume and Tempo, as well level control for the Snare and Cymbal sounds. No serial number. Non functioning. Only makes clicking sound. Sold As-Is."
Chamberlin Rhythmate
"The Chamberlin Rhythmate has the distinction of being the first drum machine ever produced. Only around ten were made by Harry Chamberlin from his Upland, California garage back in 1949. Some have said that the Wurlitzer Sideman was the first drum machine, but Chamberlin's invention preceded it by ten years. 
The Rhythmate uses a 1" magnetic tape loop which is read by a tape head that can be moved up or down to play back 14 separate drum patterns. The tempo is adjusted by moving a spindle up or down which affects the speed of the tape moving across the head. The Rhythmate has a built-in amplifier and 12" speaker. In 1951, Harry Chamberlin used his idea of magnetic tape playback (samples) to create the Chamberlin Model 200 keyboard. The Model 300/350, 400, 500 and 600/660 models followed.
In the mid 1960's, Harry's concept was used by Mellotronics to create their now famous line of Mellotron keyboards. Mellotronics did not ask Mr. Chamberlin for permission to use his idea and he was not at all happy about it. But they agreed to pay Harry $30,000 in compensation, which was quite a bit of money in 1966.
Serial: 1176. Unit works! Preset 3 doesn’t make sound. Tempo knob has been snapped, but it still there and still works. Sold As-Is."
Wexler Rockmate
"It is a “Rockmate”, distributed by David Wexler & Co. of Chicago, IL, and manufactured in Japan… There is a central knob for selecting pitch (A, B, C, D, E or F), a tempo control to the left, and a SW-VOL knob to the right. At far right, there’s a START/STOP button and a “SOLO” button. Apparently the latter has three settings, it shows quarter notes, eighth notes and sixteenth notes. On top, there are two inputs (START-STOP and SOLO) and one audio output (AMP-SW), all are 1/4″ standard jack.
There’s also a port for an AC adapter; however it appears to run on a 9-volt battery as well… Measures 7.5″ x 7.5″, by 1-1/4″ deep (excluding the rubber feet), it is housed in a bright red enameled-steel case and is quite heavy for its size. The face is gold-toned brushed aluminum.
Unit is mostly non functioning. Turns on, makes some sound, but not working correctly. Sold As-Is."
Multivox FR8L Rhythm Ace
Nomad Time Tapper
Panasonic RD-9844 Rhythm / Tempo Selector
"The Panasonic Rhythm Machine RD-9844 A. Features 4 beats ( 2-Beat, 4-Beat, Rock and Waltz) with tempo control, and a Manual/Auto Selector with Bass Drum, Snare and Hi-Hat for independent play. 
This transistor based unit has sounds that to my ear are similar to drum machine patterns on Beach House records. Real warm kick ( almost like a dead floor tom): Snare ( designed surprisingly well in that it mimics the resonance of the top snare head and rattle of the bottom snare) and Hi-Hat. Added bonus? If you turn the rhythm selector between different selections, the Hi-Hat sound either shortens or lengthens (there are only three variables but they are noticeable). Great for sampling!
Serial: S-006P-D. Works without issue!"
Guild MG10C-1 Amp & Rhythm Machine
"Hilarious rhythms and sounds. Lots of fun. The guitar amp part actually sounds great too. It still has the original 2-1/2 inch tweeter while the 12 inch, 250 watt aluminum cone driver that has been installed does a beautiful job handling the percussive bass tones that this thing puts out. If you get this, don't be dismayed if it seems a bit idiosyncratic. We've put it through it's paces and we've determined that everything functions as it should., just needs a little getting used to. Sometimes it needs to warm up a little before a few of the settings start working 100% (i noticed it mostly in waltz mode). Don't ask me why, it's almost as if this thing has a mind of its own.
Serial: 710044. Works without issue."
National Automatic Rhythm
"National is a brand name belonging to Matsushita electronics, who are better known outside Japan under another brand name, Panasonic. I’m not aware of other musical instruments sold under the National name, so I was surprised to see this drum machine show up for sale. 
Until 2009, Matsushita used the National name almost exclusively for home appliances (washing machines, microwaves etc.), keeping the Panasonic name for audio & video, so a National drum machine was unexpected… This drum machine is pretty standard for the era, similar to a Rhythm Ace. It does have three cancel switches (snare, clave, cymbal), which provides a little extra versatility, and a somewhat different set of preset rhythms (eg. Teen Beat, African Beat and Kwela). The sounds are standard for the time: tuned bass drum, toms, percussion and snare “bottom”, noise burst for cymbal, maracas and snare. As usual for this kind of device, multiple preset buttons can be pressed at the same time, creating variations I’m sure even the designers didn’t really expect… Following is a scan of the original Japanese spec sheet. The list price was 56,000 yen, which amounts to more than 600 US dollars… Ouch! But that’s OK because it had a fantastic “touch start” feature!
Serial: 721088. Works without issue."
Olson X-81 Rhythm Instrument
"The X-81 Rhythm Instrument is an analog drum machine with 10 preset patterns and controls over Volume and Tempo, as well level control for the Snare and Cymbal sounds. Unit works with scratchy pots that settle in nicely."
Welson Super-Matic S12
"Vintage analog drum machine with preset pattern rhythms and simple trigger pads. Serial: 122975. China/Aus power chord. Unable to test. Buyer be advised regarding voltages and plugs. Sold As-Is."
Wurlitzer Swingin Rhythm
"The Wurlitzer 5020 is a very early, and rare, analog drum-machine. Sounds can be played by hand on the 5 tabs (roll for snare) or one can make use of the internal rhythm presets. The sounds a unique and quite useful. Serial: E211860. Works without issue."
Concert RF-5
"Concert RF-FIVE is a little wood-veneered preset rhythm unit featuring five onboard rhythms (hence its name) and a lovely warm, mellow sound. We particularly like the kick, which is thick and almost woolly played “raw” but which comes to life in a really interesting way if you dial in some saturation and compression. 
The snare is very laid-back and the hats tick away very nicely… plus there’s a neat little woodblock / click sound hidden away in there too. Works. Missing ”slow-rock” button. Sold As-Is."
Simmons Porta Kit
"In 1988 the Portakit was Simmons' answer to Roland's Octapad. With 12 ergonomically arranged trigger zones, 7 additional inputs for external pads and one hihat controller it was probably the most advanced multi pad controller at that time. Many technical innovations came from the brand new SDX, for example the FSR trigger foils or the learn function.
Serial: 83. Unit turns on but is currently not producing sound. LCD screen is burnt out. Sold As-Is."
Welson Super-Matic S12
"Vintage analog drum machine with preset pattern rhythms and simple trigger pads. Serial: 122975. China/Aus power chord. Unable to test. Buyer be advised regarding voltages and plugs. Sold As-Is."
MatrixSynth Time Tuner 16
Roland Rhythm 55
"The Roland Rhythm 55 (sometimes known by its model number, the Roland TR-55), is a preset drum machine (or "beatbox"), produced by Roland in 1972. It was one of a trio of drum machines released by Roland that year, offering features intermediate between those of Rhythm 33 (TR-33) and Rhythm 77 (TR-77). "TR" stands for "transistor rhythm". The Rhythm 55 had analogue voice circuits to produce its drum sounds, and offered approximately 20 permutations of preset rhythms.
Serial: 484120. Works without issue."
Nomad Rhythm Maker 12 SN 1240674
"Nomad Rhythm Maker 12 from the early 1970’s. Has 12 built in rhythms: march, cha-cha, sambo, rhumba, tango, swing, foxtrot, bosa nova, slow rock, rock-n-roll and waltz. Serial: 1240674. Unit doesn't work. Sold As-Is."
LinnDrum LM-2
Cameo Rhythm Machine SN 1210227
"Serial: 1210227. Unit turns on however doesn't make sound. Sold As-Is."
Elka Wilgamat III SN 017214
"Made in Italy. 16 drum beats. Bass, chord, and arpeggio controls. Serial: 17214"
MPC Electronics DSM-2 SN 1260
"The 'standard' DSM is available as a two channel unit (DSM2), or a single unit with power supply. Each DSM channel has eight control knobs: Input Sensitivity, Decay, Bend, Pitch, Mix, Noise, and the all-important Click (a dynamically-variable burst of noise at the start of a sound, giving it that electronic percussion 'edge'). A toggle switch configures the unit for either Bass/Tom-type sounds, or Snares. A large illuminated power rocker switch at the far left of the unit, supplemented by pairs of small Trigger and Supply L.E.D.s at the bottom of the front panel rounds it all off. Rear panel connections on offer are: Pad input (accepts signals from stage pads, MPC's own 'bug' for acoustic drum triggering, and even from audio sources, if the sound is short.)
Trigger input - accepts signals from sequencers, MPC's trigger box, or any other +5 volt pulse; Accent Input and Adjust pot; Output, and Master Output which controls the output of all modules connected to the Master unit. Dual DSM's also have a power socket, taking the Master, or the separately-available DSM power supply as their source. Both Accent and Power sockets are chainable, with their functions controlled from a single (Master) DSM. Connection is via jack sockets except for Power/Accent, both of which are derived from the same 5-pin Din connector.
As might be guessed from the specs these units are capable of producing the usual electronic percussion textures, from effects to quite passable snare and tom voices. No modulation, though, so no metal clangs, and overall, the sounds, remain a little 'tuned' and electronic for my taste.
Serial: 1350. Missing power supply. Sold As-Is."
Ampeg AR-1 Rhythm Ace
Roland CR-5000 Compurhythm SN 111782
Farfisa Rhythm 10 SN 3085 / 199
"Farfisa Drummer Model 10, this is from the same company that made the organs. This seems to be overall clean shape, all the buttons work. It runs on 6 medium sized batteries and the footswitch is for momentary stop – when you release the button the drums continue. It has an attached guitar cord that goes from unit to amp. 
Also a 1/4″ jack in the back with control. I am not sure if this is additional input for an instrument or not. It has separate buttons for individual drum effects as well as tempo and volume control. It has several pre-set rhythms. This was very modern when it came out in the late 70’s early 80’s. Serial: 3085/199. Non functioning. Sold As-Is."
MPC Electronics DSM-1 SN 923
"The 'standard' DSM is available as a two channel unit (DSM2), or a single unit with power supply (DSM1). Each DSM channel has eight control knobs: Input Sensitivity, Decay, Bend, Pitch, Mix, Noise, and the all-important Click (a dynamically-variable burst of noise at the start of a sound, giving it that electronic percussion 'edge'). A toggle switch configures the unit for either Bass/Tom-type sounds, or Snares. A large illuminated power rocker switch at the far left of the unit, supplemented by pairs of small Trigger and Supply L.E.D.s at the bottom of the front panel rounds it all off. Rear panel connections on offer are: Pad input (accepts signals from stage pads, MPC's own 'bug' for acoustic drum triggering, and even from audio sources, if the sound is short.)
Trigger input - accepts signals from sequencers, MPC's trigger box, or any other +5 volt pulse; Accent Input and Adjust pot; Output, and Master Output which controls the output of all modules connected to the Master unit. Dual DSM's also have a power socket, taking the Master, or the separately-available DSM power supply as their source. Both Accent and Power sockets are chainable, with their functions controlled from a single (Master) DSM. Connection is via jack sockets except for Power/Accent, both of which are derived from the same 5-pin Din connector. As might be guessed from the specs these units are capable of producing the usual electronic percussion textures, from effects to quite passable snare and tom voices. No modulation, though, so no metal clangs, and overall, the sounds, remain a little 'tuned' and electronic for my taste.
Serial: 923. Unit turns on but makes no sound. Sold As-Is."
Univox SR-95 Analog Drum Machine
"Re-badged Keio Mini-Pops MP-7. Keio is the forerunner of the mighty Korg empire and the Mini Pops is the iconic and unique-sounding analogue beat box famously-used by Jean-Michel Jarre on his Oxygene album. They may seem simple but they just have "that sound" and we have a real soft spot for them and always have one in the studio. Standard preset rhythms can be modified by simultaneously pressing combinations of buttons. The "Quijada" sound is instantly recognizable and unique to the Mini Pops.
Serial: 780182. Works without issue. Includes working footswitch."
Sears Rhythm-Matic SN 41 73
"The Sears Rhythm-Matic Analog Drum Machine is an extremely RARE and fantastic instrument find! The awesome analog drums are great for bending, modding, sampling, or playing! - And the simple layout and user-friendly features make it perfect for the music studio, live gigs, or even the beginner romper-stomper!! Serial: 4173. Works. Has a quiet output. Sold As- Is."
King Beat (Sears) Rhythm (R1000)
"Serial: G4969. Works without issue."
King Beat 7
"Vintage Japanese Drum Machine called The King Beat 7 made in the 60s. The drum machine was made in Japan and features 7 Different Beats: Slow Rock, Latin, Twist, Fox Trot, Waltz, Mambo and Go-Go. Also features volume and tempo control dials."
Paia Drummer Boy
"Taken from an interview with Moby about this exact machine..."Yeah. You’d spend a hundred dollars; they’d send you the kit, and you’d have to install it yourself. Also, it’s orange. This is someone’s homemade drum machine, I’m guessing from about… nineteen… I don’t know, what would that be seventy? And it’s weird because whoever made it, I think left out some of the circuitry, because it doesn’t (AWFUL PIERCING SOUND!)… That’s not supposed to sound like that. Let’s try again. (Awful piercing sound, again, only not as loud.) Hmm… let’s see what… It might’ve broken even more since the last time, because it used to actually work. (Sound continues.)" - Moby
Unit doesn't turn on. Sold As-Is."
Keynote Auto-Rhythm Mark XX MR-101
"The MR-101 is a very tight & bright sounding beatbox. Not much hiss or hum compared with other more popular boxes. With 20 base beats available, there's plenty of variety & it definitely has a unique sound. - There are 3 variations total for each of the first 5 beat buttons. Unit works albeit scratchy pots and a noisy output. Sold As-Is."
Domino Rhythm By Domino
Regal Rhythm RE-175 SN 2280
"A very nice little 6-button machine. The kick drum is super low, full & rubbery. They also made these with a cool looking spacey graphic bright red front panel. Serial: 2280"
Elka Drummer One
"The Elka Drummer One Analog Drum Machine has 16 preset rhythms and 9 individual drum sounds that all have volume knobs on the front of the unit. No serial information. AU/CN power cord. Unable to test. Sold As-Is."
Gemini Model R-777 Compurhythm Beatbox
"Late 70's groundbreaking drum machine manufactured by Gemini No serial information. Made in Taiwan."
Custom Made Electronic Congo / Bongo
Kay R-16 Rhythmer SN 0611117
"Serial: 611117. Works without issue."
Sound Master SM-8 Rhythm 1 with original box
"Back at the start of the '80s, a new market was opening up for cheap, user-friendly beatboxes aimed directly at guitarists and bass players. Around that time, quite a few of these preset "stomp box" style rhythm machines were released by various manufacturers designed specifically for practice and auto accompaniment. Sound Master, who are remembered mainly for their best selling Dr Rhythm style SR-88 "Memory Rhythm", released two stomp-box models. Their first called "Rhythm 1" came with regular rhythms but later, they must have had a re-think and issued a second model, the cheekily named "Disco Beat" complete with a silver metalflake paint job and black stars!
No serial information. Currently non functioning. Sold As-Is."
HDB Audio ACM-2 Clap Cussion Analog Clap Synthesizer SN B 01883
"Touched by Sound ACM 2 Analog Clap Percussion Synthesizer. Made in Germany by HDB, the Clap Cussion Synth simulates the Roland Tr 909 808 707 606 clap sound but with more treatments like filter, resonance, high pass (post filter), reverberation, decay and noise generator. Unit can be triggered via midi or front panel trigger.
Serial: D01883. Unit powers on but makes no sound. Sold As-Is."
Olson X-100 Rhythm Beat
"The X-100 is an analog preset drum machine from the 1970's. It features 10 preset rhythm patterns, 8 drum sounds, button triggers for each sound, and control for volume and tempo. Unit works without issue."
Whippany Electronics RM-10 Rhythm Master SN 7631
"Vintage Preset Rhythm Machine Combine The Beats By Holding More Than One Button Down Or Use Them Individually. Serial: 7631. Works without issue."
Supersound Drummer CRM260
"For the collector of ancient analogue stuff- this is a super find- for the rest, it's probably crap. The drums themselves are devilishly simple. Extremely tight kick bass with a "wiff" snare that sounds like a low-end suction *pop*. 8 preset drum loops, "Trot," "Waltz," "Rock," "Slow Rock," "Disco," "Cha Cha," "Bosa Nova," and "Rhumba." Volume and Tempo knobs. Machine is about 6" x 2" x 4" (yet still has rack mount handles). Runs only on 9v battery with mono output.
Very fun, indeed doesn't work. Powers on, makes sound, but stuck on one sound. Sold As-Is."
Boss DB-66 Dr. Beat SN HF30630
"The DB-66 Dr. Beat is a longtime standard in professional electronic metronomes, thanks to its innovative features and helpful slider-based control over individual note volumes. Serial: HF30630. Works without issue."
MPC Electronics The KIT Integrated Electronic Drum Machine w/ Bass Drum High Hat Switch
"The Kit is a vintage analog drum pad kit with Snare, Hi Tom, Low Tom, Bass, Cymbal, and Hi Hat sounds. The sounds are triggered via the pads with corresponding volume knobs for each drum sound. The Hi Hat section has 6 preset patterns that can be selected from and played back with a variable tempo knob. The Hi and Low Tom sounds have trigger inputs while the outputs include Mix out and individual outs for each sound.
Serial: 2014. Works albeit with scratchy pots."
Roland TR-33 / Rhythm 33 Drum Machine 1970
Wurlitzer Swingin Rhythm
Gulbranson Electro Rhythm
"No serial information. Unit turns on however doesn.t make sound. Raw wires coming out of the back. Sold As-Is."
Schober Portable Dyna Beat
"The Dynabeat is great vintage drum machine with trigger buttons for each sound and a sustaining castanet sound. This Dynabeat is fully functional and in excellent cosmetic condition. Sounds include: Bass Drum Tom Tom Wood Block Lo Wood Block Hi Cymbal Brush Cymbal Crash Bongo Hi Bongo Lo Snare Castanet Unit powers on but doesn’t make sound. Sold As-Is."
Maestro Rhythm Jester SN 13264
"This is a vintage Drum Loop Machine from the 70's. It's all analog and sounds phenomenal. The kick sounds big and fat, and everything else sounds very warm and extremely punchy. This is somewhat of a rare machine that you don't see too often and definitely a hidden gem. Serial: 13264. Unit doesn't work. Missing start/stop button. Sold As-Is."
SideKickEr Automatic Rhythmer
Univox RK-12 Rhythmer
"Serial: 682. Unit works however it doesn't sound very cool. Sold As-Is."
Univox MR-8 Micro Rhythmer
"This vintage analog drum machine works great and creates just the sound you need to keep a beat while playing guitar. The MR8 model has eight different drum pattern settings, including Latin-hustle, Waltz, March, Rock, Bossa-Nova, Beguine, Waltz-Rock, and Swing. Each drum pattern is unique and crisp, providing you with a high quality but throwback sound."
Teac Rhythm-8
"Vintage Teac Rhythm 8 Drum Machine in great condition. Pretty straight forward setting and controls and nice and compact. Sounds great with a cool sounding built in speaker. Not a lot of info on these out there, but it’s a cool sounding machine Serial: 883. Unit works albeit with scratchy pots. Sold As-Is."
Roland TR-330 SN 070153
Seeburg Rhythm Prince RP
"1960's Seeburg Rhythm Prince drum machine. One of the earliest drum machines. Model RP is 18 watts at 15 amps.
8 beats include fox trots 1 and 2, rhumba, samba, cha cha, marches 6/8 and 2/4, waltz. Wood sides in very good shape"
Kay DRM-1 Memory Rhythm Machine
"Kay Memory Rhythm Machine DRM-1. Circa 1981/82. A nice analogue drum machine with four sounds - Bass drum, snare, hi-hat and cymbal. Very similar to the Boss DR-55 - without the rimshot but with programmable hi-hats, and virtually identical to the Soundmaster SR-88.
16 or 12 step sequencer with clock out and a programmable trigger output. A basic rhythm machine but full of character.
Serial: 2609. Works without issue."
PVP Industries Drum Machine
Jasper Electronic KR-30 Mini Rhythm SN 10181
Keytek MDP 40 Mini Digital Percussion
"Absolutely nothing is known about this very rare and obscure digital drum machine. In fact, all I can do in this situation is quote from Dutch donor, Bert Koorengevel: "I am a proud owner of this little monster of mediocracy, a Keytek MDP40 drum computer. I bought it used around 1990, without a box or manual. A Google search on "Keytek MDP40" returns no hits at all - I hope Hollow Sun can save it from oblivion! 
As I understand it, Keytek was the company in between when Siel folded and Roland took over the remains. MDP stands for 'MIDI Digital Percussion' and 40 is the number of pattern presets. It was built in Italy around the mid 80s and features 12 different sounds which take up around 128Kb when sampled in 16bits. The sounds are bass drum, snare, rimshot, tom, closed & open hihat, cymbal, handclap, shaker & cowbell. It's not velocity sensitive but does have low-velocity versions (intended as brush or for variation?) of the bass, snare & closed hihat. One could play drums manually on the device itself or by MIDI In. The latter is how I do it since the switches for base & snare drum have worn down. The lousy bouncing contacts result in 3 or 5 shots instead of one!
Serial: 6005."
Seeburg-Gulbranson Select-A-Rhythm SN 10495
"The Seeburg Select-A-Rhythm was made in 1968 by the famous Seeburg jukebox company. The Select-A-Rhythm has its roots in a company called Kinsman. They made inexpensive organs from the '50's (the Kinsman "Carlyle" model was one of the first organs to have automatic rhythm). (JG) Kinsman used neon dividers driven by a tube master oscillator & developed the Select-A-Rhythm which later appeared on Seeburgs and Gulbransens. You'll occasionally see a Select-A-Rhythm with the Gulbransen logo. One of my favorite beat boxes, the Select-A-Rhythm offers 17 base beats (plus "Metronome") utilizing some of the coolest sounding classic analog voices.
Serial: 10495. Works without issue."
Vermona ER-9 Drum Machine
"The Vermona ER-9 is a rare vintage (1976) East German rhythm box. The manufacturer is VEB (Volkseigener Betrieb) Klingenthaler Harmonikawerke.
It’s not programmable, but presets can be free feely combined, and every drum sound has a dedicated volume control.
Serial: 141056. EU power cord. 220V. Unable to test. Buyers be advised. Sold As-Is."
Rising Rhythmer R-1
"This is a very rare Japanese drum machine from the 1970's. It has very unusual styling for a drum machine, looking more like a piece of high-end 1970's hi-fi, all brushed aluminum and black steel.Unit works but the output is finicky. Could of bent knobs. “Reverse” function doesn’t seem to work. Sold As-Is."
EDC SR-99 Programmable Rhythm
"The brand name 'Soundmaster' is no more it would seem, although the company are still surviving only now they go under the catchy moniker of Electro Dynamics Corporation. The Programmable Rhythm SR99 shares an almost identical metal case with it's obsolete stablemate, the SR88, but has far greater capabilities. 
The unit is finished in all over black with dayglo orange, green and silver graphics which makes it look quite hi-tech and contemporary. The sounds are the same as those found on the '88 — you can't expect a great deal from a beatbox in this price range and the '99 is no exception to this rule. The snare is very modern sounding, more like a clap than anything approaching a real drum. The bass shifts air but is too highly pitched to pin down a bass line. Hi-hat is the usual metallic sound — nothing like a real hi-hat but certainly usable. Cymbals are always the most difficult sound to synthesize (or sample) but the '99's is particularly poor, being merely a burst of white noise."
Seeburg-Gulbranson Wurlitzer Select-A-Rhythm
"The Seeburg Select-A-Rhythm was made in 1968 by the famous Seeburg jukebox company. The Select-A-Rhythm has its roots in a company called Kinsman. They made inexpensive organs from the '50's (the Kinsman "Carlyle" model was one of the first organs to have automatic rhythm). (JG) Kinsman used neon dividers driven by a tube master oscillator & developed the Select-A-Rhythm which later appeared on Seeburgs and Gulbransens. 
You'll occasionally see a Select-A-Rhythm with the Gulbransen logo. One of my favorite beat boxes, the Select-A-Rhythm offers 17 base beats (plus "Metronome") utilizing some of the coolest sounding classic analog voices. Serial: 8528. Works albeit with a noisy output."
Ace Tone Rhythm Fever
"The Rhythm Fever is basically a repackaging, with a ‘stylish-modern-turn-of-the-eighties’ enclosure, of classic Rhythm Ace units such as the FR-6, minus the wood. A few of the rhythm patterns are different (this one has ‘disco’!!), but the internal circuitry hasn’t changed much, if at all. In fact, after comparing the voice board for a few Ace Tone drum machines, I realized that they were all the same!
Serial: 8515556. Works without issue."
LaFayette Rockbeat
"The LaFayette "Rockbeat" is a bright red largeish pedal sized rhythm machine. It has each of the beats (6 & a fill) actually charted out on music staves on the top panel. There's a "Solo" button which kicks in the fill (endless 16th notes on snare & hat) for as long as you hold it down. 
This particular pedal was marketed in 1966 by the LaFayette Radio Electronics Company, but made in Japan by the Keio Electronics Company who later became Korg. There were several other dupes of this box sold by Olson & other companies.
It was a very popular product at the time (coincidentally used by Morris Day & The Time at Indigo Ranch Recorders in the '80's....."O-E-O-E-Oh!".....) & is believed to be the first solid state drum machine ever made.
No serial information. With 1/4" cable."
Mark II MDD-800 Digital Drum System
"This is a Mark II MDD-800 electronic drum machine module (brain).This module has 100 songs programed into it. It has individual buttons to cancel out the bass or keyboard and secondary drums that can be added or eliminated. 
There is tempo control, master volume, digital readout ,midi in and out, reverb, headphone jack,7 inputs, line out, pedal control etc..It is built into a metal box which has some scratches that in no way affect the functions of this module. The module is in complete working order. The bottom is flat with new Velcro applied so you can secure the module as you see fit. It uses a 12volt power supply that is included in the auction. It also includes an 8 inch drum pad/ trigger. I have personally tested this trigger with this unit and it is in complete working order. The good thing about this style of trigger pad is that it can also be used as a practice pad for silent practicing. I do not have the owner's manual.
The unit is fairly intuitive to figure out. Has some good usable sounds pre programmed. It would be a great addition to your acoustic kit for that one special effect.
Serial: 22-01-02-03474"
Mach RB-801 Rhythm Box
Very rare MACH drum machine from the 1970's.
Tronix RB-1 Rhythm Box
"Tronix RB-1 Rhythm Box has array of rhythm options that can be plugged into PA, etc. Great 70's technology in a pint size box . Can operate on 9V power supply (not included) or 9V battery. Std 1/4" plugs."
Rhythm Boy 480 Drum Machine
Suzuki RPM-40
"This is a cool old school drum machine from the 80s. Suzuki rebranded several SIEL MIDI synths and beatboxes, and this is one of them. It's not very programmable, but you can chain preset patterns together. The cool thing is that you can trigger all 10 drum sounds individually via MIDI, which adds to its usefulness.
Serial: 2446. For the most part, this unit works. Preset loops work but some drum buttons triggers are broken."
Seeburg-Gulbransen Select-A-Rhythm
"The Seeburg Select-A-Rhythm was made in 1968 by the famous Seeburg jukebox company. The Select-A-Rhythm has its roots in a company called Kinsman. They made inexpensive organs from the '50's (the Kinsman "Carlyle" model was one of the first organs to have automatic rhythm). (JG) Kinsman used neon dividers driven by a tube master oscillator & developed the Select-A-Rhythm which later appeared on Seeburgs and Gulbransens. You'll occasionally see a Select-A-Rhythm with the Gulbransen logo.
One of my favorite beat boxes, the Select-A-Rhythm offers 17 base beats (plus "Metronome") utilizing some of the coolest sounding classic analog voices.
No serial information. Works but is in very rough cosmetic shape. Scratchy volume pot. Sold As-Is."
E.S.P. Electronically Simulated Percussion Drum Machine
Thomas Band Master Model 55 SN 1086262
"Very unique and great sound machine. What sets this one apart from other from the same era (Besides the furniture grade cabinet) is the ability to create your own variations on the patterns by selecting only the sounds you want. So, on any patter, you could have just kick and snare, or just cymbal, or everything all at once. Plus, it has individual buttons for one shot hits or fills. Has a great, gritty, lo-fi sound with a really punchy kick.
This unit turns on but unfortunately doesn’t make sound. Has hard wired RCA mono out. Sold As-Is."
CRB Diamond 725
"Italian analog drum machine with preset patterns. CRB Elettronica was based in Ancona, a famous zone for some electronic instruments productions during the seventies.
Serial: 3877. AU/CN power cord. Currently unable to test. Sold As-Is."
Roland PB-300 Rhythm Plus
Kay R-8 Rhythmer
"Extremely rare solid-state unit typical of Drummachines from the early 1980's - The R8 has eight Presets: Waltz, Slow rock, Fox Trot, Latin, Mambo, jazz Waltz, Rock and Cha Cha - Automatic controller: Volume, speed - Start/stop key - Power LED - monophonic 1/4" mon output - Dimensions: approx. 29.2 x 21.5 x 7.0 cm 117 Works without issue."
So every single listing has already been sold!?! That didn't take long.
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