Sorry for the delay on this, but I did get a quick glance at my OSI 400 manual finally on the weekend and yes, it is different. I just took a shot of the first page - you can see the date is July 1976 rather than 1977 in the manual you posted, and there are some differences, like the mention of the TIM monitor.
I will def get this scanned, but I have a big pile of requests and have been having a hard time with some of the bigger manuals and assembling them nicely in Adobe Acrobat, which I find a bear to work with.
But yes, I guess I got an earlier manual. I don't know exactly when the 400 came out?
OSI 400 Board
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Re: OSI 400 Board
Here's the scan of the first page of my manual.
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