Grass Valley Imagestore 750 v.3.0.1 - Manual (Page 259)

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Imagestore 750 Hardware Revisions
Appendix C makes a brief statement about Imagestore 750 versions.
The Imagestore 750 hardware platform underwent a hardware maintenance revision at the end
of September 2011.
The internal CPU module was replaced with a more modern one; although the form, fit, and
function of the Imagestore 750 are unchanged and there are no new product features (since
version 4.1).
Such revisions of the Imagestore 750 are designated “IS-750 R2”, which is evident on the user
front panel and on the serial number plate (on the side of the Imagestore 750, at the rear).
The IS-750 R2 units require software release 4.2.1, or later revisions, to operate. This software will
work on both IS-750 R2 and earlier Imagestore 750s.
Warning: Do not down-grade IS-750 R2 units to software earlier than 4.2.1.