Please also note that I'm talking about the Lisa OS (subfolder LISA_OS in the source code ZIP), not the Lisa Toolkit (subfolder Lisa_Toolkit in the source code

Please also note that I'm talking about the Lisa OS (subfolder LISA_OS in the source code ZIP), not the Lisa Toolkit (subfolder Lisa_Toolkit in the source code ZIP). It's actually not a surprise I see some Clascal files in the Lisa OS tree since LIBTK in LISA_OS/LIBS is apparently just a copy of the Lisa Toolkit.