> On Mar 23, 2020, at 19:47, Richard Salz wrote: > > > Yes, "Typesetter C" was to accommodate the C Version of troff written > by Ossana and I checked the source, it doesn't use stdio. > > I thought Ossana's troff was written in assembler and translitered back into C after he died. Nope. I have it from good a good source he did it himself. I seem to remember that the old assembler version had build in constructs for headers and footers and which got radically removed in the C-version. That one gave you the famous trap mechanism etc. Although the basic structure of the assembler version starts out the same it quickly deviates, so it cannot have been turned from as into C. The N/TROFF manual describing the C version stems from 1977. Wikipedia dates the rewrite into C from 1975 (See >). I seem to remember that there where actually two versions of Edition 6 unix. The second one came with typesetter C but my memory is foggy about these details. jaap