The Roland MTR-100 was a digital

Digital

A digital system is a data technology that uses discrete values. By contrast, non-digital systems use a continuous range of values to represent information...

 tape recorder used for storing sequence programmes for the Roland MC-4 Microcomposer

Roland MC-4 Microcomposer

The Roland MC-4 Microcomposer was an early microprocessor-based music sequencer released by the Roland Corporation. It could be programmed using the ten key numeric keyboard or a synthesizer keyboard using the keyboards control voltage and gate outputs...

. It was offered as an optional accessory for faster data

Data

The term data refers to qualitative or quantitative attributes of a variable or set of variables. Data are typically the results of measurements and can be the basis of graphs, images, or observations of a set of variables. Data are often viewed as the lowest level of abstraction from which...

 transfer than a standard audio cassette player.. When using a Roland MTR-100, the Roland MC-4 Microcomposer

Roland MC-4 Microcomposer

The Roland MC-4 Microcomposer was an early microprocessor-based music sequencer released by the Roland Corporation. It could be programmed using the ten key numeric keyboard or a synthesizer keyboard using the keyboards control voltage and gate outputs...

 needed to be fitted with the additional memory option known as the OM-4. The MTR-100 used digital computer cassettes, Roland endorsed the use of TEAC Computer Tape CT-300 or Maxell

Maxell

, commonly known as Maxell, is a Japanese company which manufactures consumer electronics. The company's notable products are batteries -- the company's name is a contraction of "maximum capacity dry cell" -- and recording media, including audio cassettes and blank VHS tapes, and recordable optical...

Data Cassette Tape CT-300 or M-90..