Ensoniq EPS – Version 2.40 Firmware Update Upgrade for Sampler Synthesizer OS


Ensoniq EPS – Version 2.40 Firmware Update Upgrade for Sampler Synthesizer OS

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Ensoniq EPS – Version 2.40 firmware OS Update

This is firmware update 2.40 and is the latest known official released operation system by Ensoniq Corp. This operation system update/upgrade requires two eprom chips as revealed in the article`s photos and the chips will be labeled to help you locate the correct chip socket. For more info, please check below.

Firmware 2.40 is required to use Version 2.49 Operation System disk

Features/Improvements for OS disk 2.49

  • The COPY FLOPPY utility on the EDIT/System page has been fixed.
  • Removable SCSI drives are no longer surveyed like the internal floppy drive for disk (cartridge) being changed. Since the disk change status will be saved for a SCSI device, changing the disk (cartridge) will still be handled correctly. This prevents MIDI communication problems from occurring when the EPS is being controlled by an external sequencer.
  • In previous versions, loading banks repeatedly from SCSI drives could cause the system to behave unpredictably. This has been fixed in the current version.
  • When resaving a multi-disk sound, it was possible to end up with part one saved twice, thereby making it impossible to reload. This has been fixed.
  • Inbound controller #70 (patch select) messages are now handled correctly in MULTI mode. In version 2.40, patch select buttons which were pressed via MIDI were impossible to clear except by rebooting the EPS.
  • There was a bug in previous versions which caused the machine to behave unpredictably when files were loaded via MIDI commands AFTER a bank load. This has been fixed.
  • The PAGE words in the display again indicate the file type during load operations. This function had been disabled in version 2.40.
  • In previous versions, the QUANTIZE operation could move notes near the end of a sequence to the last clock, rather than quantizing them to the nearest note. Sometimes, these notes were not heard. This has been fixed.
  • There was a bug which made it possible for a SONG file to use much more memory than it actually needed. This has been fixed.
  • In SONG mode, a newly-recorded song track played back out of time while auditioning, but was OK after a KEEP NEW. This has been fixed so that the track plays correctly in audition.


  • Fully verified before shipping and professionally packaged in anti-static material.
  • This Firmware eprom will not work for EPS-M [Latest here is called 2.41]
  • EPS version 2.49 OS disk can be found online for free download