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Emulator II : Operating System Versions
OS 1.6 First known production release
of the Operating System. A very early version which came with a 12 page manual (Short Form Operator's Guide). The sequencer and SMPTE were not properly implemented.
OS 1.7
Released in 1984, still no sequencer or SMPTE functions.
OS 1.8a No details known, but we presume it added the sequencer.
OS 2.1 This is a major improvement release, that was available from 20 May 1985. New documentation was
included, "The SMPTE Supplement". The software contains:-
- Fully functional SMPTE interface
- Velocity Switch threshold increas
- Click track output added
- New error message for out of voice/preset memory
- Two overlays in sequencer module
- High C# phantom note eliminated
- Mac interface bug corrected
- Erase Preset crash fixed
- Retrieve full 17.6 second library sample works
- Sequence end works properly
- MIDI transmitted clock is stable
- Short library disk file bugs fixed
- Non existant controller erase ignored
- External clock works after sampling
- Most wheel jumps eliminated
OS 2.2 No details known, other than this release is needed to interface the EII to a Mac. However it has a bug in it ...see OS 2.3.
OS 2.3
This is a small but important release change. It was available from 25 September 1985. If fixes a bug in the Mac interface, whereby the EII locked up if you powered the Mac up after the EII. It is the software release found in many Emulator II's. The full Craig Anderton Owners Manual is based on this release. It needs boot EPROM 2.1 or HD2.2.
OS 2.6 HD No details known. We suspect this is the first HD release.
OS 3.0/3.0 HD Added some useful new functions, and finally nailed the remaining bugs. It needs Scanner EPROM 3.0, which was supplied as an upgrade with the OS. It cost $75.00, due to the PROM change. You can run OS 3.0+
on an EII without the new scanner PROM, but you will not get all the updates. The new features were:-
- MIDI Supermode.
- The ability to switch double memory banks over MIDI via program change #00. This is needed for the EII+.
- Improved SMPTE, no hesitations.
- MIDI preset changes are not echoed over MIDI out.
- No stuck notes when MIDI notes arrive for unassigned areas of the keyboard.
- MIDI play sent out at the SMPTE start point, rather than at play.
OS 3.1/3.1 HD The final Emulator II production release. This seems to be exactly the same as 3.0 but it is the release that is often found with later model
Emaultor II's.
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Boot ROM's 
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Latest version is 2.1
* EII OS 3.0 Upgrade
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OS 3.1/3.1 HD 
