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UNIX floating point on the /34

From Doug Gwyn from here (Jan 13, 1984):

It was fairly easy to take the 6th Edition UNIX 11/45 floating-point processor (FP11) support and add it into the 11/40 version for a PDP-11/34. One subtle problem with using the 11/40 kernel on an 11/34 is that the faulted-instruction restart code was not entirely correct for the 11/34, although later the 11/23 was again 11/40-compatible in this regard. The 6th Edition UNIX floating-point support also had some bugs that needed to be fixed if one was going to make heavy use of floating-point on an 11/34 or 11/23

Jnc (talk) 17:16, 7 March 2023 (CET)