Sequential Circuits Drumtraks - MIDI Drum Machine (1984)

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Pics of the inside below.

"The Sequential Circuits Drumtraks was the first drum machine that supported MIDI. (The Drumtraks can also send DIN sync and clock.) And while the drum pads were not velocity-sensitive, you can control it via a MIDI keyboard and trigger it with different velocities. While the kick sound is a bit thin, the 13 8-bit sounds can be pitch-shifted dramatically, adding some flexibility.

VOICES
Main core 8 bits NEC D780C-1 CPU part of Z80 ZILOG family manages 6 channels:

Channel 1: Bass Drum
Channel 2: Snare / Rim
Channel 3: Tom 1 / Tom 2
Channel 4: Crash cymbal / ride Cymbal
Channel 5: Open / closed HH
Channel 6: Claps / tambourine / cabasa /cowbell

WAVETABLE
Features 13 PCM waveforms at 8 bits resolution stored on socket EPROMS Erasable Programmable Read Only Memories. Each sound features individual gain and a pitch tune quantised into 15 different steps.

EPROM
It is possible to change the soundset by swapping the eproms, use a prommer for this task.


FILTER
The TOM channels are filtered by famous chip Curtis Cem3320

SEQUENCER
Records in real-time mode or step mode
Recording quantisation at variable resolution levels from 1/2 to 1/96 in ten values: 1/2, 1/4, 1/6, 1/8, 1/12, 1/ 16, 1/24, 1/32, 1/48, 1/96 or swing shuffle.

SYNC
Internal frequency tempo range from 40 to 250 BPM, sync mode available in 2 ways:
1- digital Midi clock 
2- analog sync IN at 24 /48 /96 PPQ resolution
Drumtraks outputs at 24 or 48 PPQ resolution

MIDI
Each sound is triggered with velocity levels and pads output MIDi with dynamic.

MEMORY
Holds 3289 notes, 99 patterns (100 measure) and 99 songs.
Data can be saved either to :
- midi exclusive dump
- tape backup"