The NIROS manuals contain details of all operating system updates since the previous manual; including updates to BASIC, and details of new or updated hardware. Once something has been described it will not usually be covered again in subsequent manuals unless a relevant change has been made, so to get a complete picture of the 8870 you really need all the NIROS manuals including the revision manuals.
I remember this release as I believe it introduced support for the BA80 VDU and that gave us two windows; better than having two terminals on your desk, and it supported the new MD07 laser printer.
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