Advantages of Older or Different Operating Systems

It would be nice and easy to say that the latest operating systems for each EPS/ASR instruments was the best to use, absolutely. This is the case with the Original EPS - there is no advantage of using an older operating system, since the last (2.49) has everything and fixes everything.

This is not necessarily the case with the 16-Plus or the ASR-10/88. Although the last operating system for each may be the most reliable to use, some of the older operating systems do have certain benefits.

Below is a chart of most of the released and unreleased operating systems, a description of possible usages, and a download. Recommended OS's for regular use are in bold.

Important Note: These downloads DO NOT WORK on Windows XP! Please see Article 32, Floppy Image Boot Disks for all-in-one Win98 boot floppy images, that allow you to write OS floppies on any Windows operating system.

Note: We are working on getting support for the OmniFlop driver. We plan on having on having a OSMaker program that writes a OS disk with one-click. Stay tuned!

Instrument Operating System Blocks Usage File

2.49 (EPS), 1.30 (EPS 16-Plus), 1.61 (ASR-10), 3.53 (ASR-10) - This is a collection of OS file images that you can use in Translator or other program to write to floppy or hard drive as the Operating System for that volume. Download

1.95 167 Of no use; introduced automated sequencer mixing, added SCSI support. Download
2.35 167 Of no use; fixed various bugs. Download
2.40 167 Of no use; added a buggy COPY FLOPPY DISK function Download
2.45 167 Of no practical use; interim OS Download
2.49 167 Recommended for use; fixes COPY FLOPPY DISK, adds several SCSI and Sequencer functions Download
1.00 167 First release, no advantages to use Download
1.10 167 Useful for translating Sequences/Songs from Original EPS format (avoids length bug in 1.3) Download
1.17 167 Beta unreleased OS; adds LOADFILE event operation in Sequencer. Macros do not work.
Click here for related information
1.19 167 Practically identical to 1.17; no differences observed. Download
1.30 167 Last OS release. Adds important features such as MIDI Bank Load, Seq Loop parameter saved, several handy sequencer features. Introduces Seq/Song length bug. Does not include LOADFILE event command. Download
1.25 174 One of the first releases, no advantage to use. Only works with ROM BIOS versions lower than 1.5 (usually 1.0). Download
1.61 173 Useful for quick normal operation without Audio-Tracks and Akai/Roland translation. Requires ROM BIOS 1.5. Download
2.01 222 Adds Audio-tracks (RAMTracks and DiskTracks). There is a performance tradeoff in speed of operations and sonic response in certain situations. Larger in size, load time is slower. PC Download
2.51 222 Fixes for 2.01 (assumed) Download
3.00 382 Adds Akai/Roland translation. Perhaps slows down normal operation slightly compared to 2.01; not confirmed. Adds sonic bug in PHASER+REVERB algorithm (adds a scratchy tone). Still larger in size, load time is slower. Download
3.52 382 Fixes PHASER bug, other minor functions not mentioned. Download
3.53 382 Differences from 3.52 unknown. Download
Summary and Suggestions  
Use 2.49; you have no advantage using any prior OS's.
Use 1.30 on a regular basis. However, in any case where you are translating Original EPS Seq/Songs, use 1.10. Also, you might want to use 1.17/1.19 in cases where you want to automatically load new Instruments in a Sequence.
For common everyday use, we suggest using 1.61 (yes, the older one!). However, you will have to use 2.0 for Audio-Tracks, and 3.53 for Audio-Tracks and/or Akai/Roland translations. It is not documented if 3.53 is more reliable in normal operation than 1.61, other than quicker operation; however, it might be.

Downloading Information
All the downloads are a Disk Images that can be used with most/any popular Ensoniq-disk-writing program. Only the ASR Operating Systems are available for Mac download, since the Mac cannot write images with the OS on them to floppy disk.

Checking your OS version and the ROM BIOS version
On all Ensoniq keyboards, press COMMAND and then double-click on the ENV1 button. Scroll up 1 to the SOFTWARE INFORMATION page, and press ENTER-YES. You will see the OS version first (RAM), then press ENTER-YES again. You will see the ROM BIOS (ROM) version. Press ENTER-YES again, and you will see the KEYBOARD version (not of any use).

Miscellaneous Information

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