Roland MT-32 Stuff

Dr. Scott M. Baker Page
   Vintage MIDI: Roland MT-32, Roland SC-55, HardMPU, and an Xi 8088
   PS2-TTL Serial Adapter for RC2014 and MIDI

Roland MT-32 Service Notes 1st ed.
Roland MT-32 Service Notes 3rd ed.

Ultimate Roland MT-32 Tutorial (Phil's Computer Lab)

Serial Port Controller, HITR Page 235 physical (Oct 1990)

Serial controller Types 

  • Type 1 appears identical to the serial portion of the IBM PC AT Serial/Parallel Adapter.
  • Type 2 incorporates all functions of Type 1 and also supports FIFO mode.
  • Type 3 incorporates all functions of Type 2 and provides DMA mode.
  • Type 4 incorporates all functions of Type 3 and provides additional I/O addresses.

Note: Some systems using the Type 2 controller do not support the FIFO mode. For information about individual systems refer to the system-specific technical reference manuals.

Note: Do not exceed 19.2K Baud with Type 1 and Type 2 Serial Controllers. In short, older PS/2s can't reach the serial Baud rate needed [parallel is something else].

31,250 baud directly supported on Types 3 and 4 using the High Frequency Mode, divisor of 22 [decimal]. Percentage of error Difference between Desired and Actual 0.538

Content created and/or collected by:
Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

Ardent Tool of Capitalism is maintained by Tomáš Slavotínek.
Last update: 08 May 2024 - Changelog | About | Legal & Contact