Big Flash
EOS versions 4.01 and higher are so much bigger than the earlier releases of EOS that it needs more space in Flash (or CPU) ROM than is available in non Ultra Emulators.
The existing 1MB SIMM needs to be replaced with a 2MB SIMM. This is ONLY available from E-mu Systems. It costs between $99 – $129 for the rack Emulators
(depending on whether you already have the EOS link software). It comes with the latest 4.xx software. The E4K upgrades are much more expensive at up to $595.
Check the E-mu Systems web site for details.If you have an Ultra, then you already have enough CPU ROM to run EOS 4.0+.
Bugs Life EOS 4.01 has bugs. E-mu Systems released EOS 4.02 in late 1999 to fix these. So you can only upgrade a pre-Ultra sampler to 4.02 or higher now.
If you have 4.01, you should plan to move to 4.02 or 4.10 (however it can be tricky to install!).
EOS Link The 4.01 Classic upgrade optionally includes the EOS Link software, if you need it.
Source: http://nonaudio.wordpress.com/emulatorarchive/emulator-iv/emulator-iv-eos/[/SIZE]