> Odd. 1988 sounds more like 1.2 (i.e., the version from *ProDOS* 1.5).
I downloaded BS versions 1.2 and 1.3 and compared them to the 1988 v1.5.
There were a lot of similarities to v1.2 with code being in the exact same place. But there were still a lot of changes made to the 1988 v1.5 I have which indicates I may have picked up a modified v1.2 that had been renamed to version 1.5.
In comparison, v1.3 had no groups of code in the same place as the 1988 v1.5 or v1.2.