Significant work to recover original codeline and lore by Charles Lasner (cjl) Upstream is a repository at ibiblio.org.
The recovery of the 8K overlay was a collaboration between Bill Cattey and Charles Lasner for the purpose of preservation of the history and disseminating the lore of how FOCAL-69 was crafted.
DEC-08-AJAD-D.pdfhas been certfied by cjl as the definitive FOCAL 69 manual. This in spie of its front cover saying it is FOCAL-8. Apparently FOCAL-8 was a product based on FOCAL-69 that had some changes of dubious value.
overlayscontains overlays to add features to FOCAL69.
You will get a non-fatal error:
RD C100 +0001
This is just a redefinition of a symbol. The new definition is accepted.
We use run from a load of
FOCAL.BN because we often use overlays.