I have had good luck with a secfor convolver from the same page as this
comment:
http://www.chdickman.com/pdp11/lbn2rx50.cIt will go both ways,
to and from physical block order and logical block order. For people
working on P/OS or RSX, without a c compiler, here is a utility that can
convert from track/sector order to LBN order.
https://rsx11.blogspot.com/2018/02/rsx-utility-for-converting-track-sector.…
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Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason(a)ccomcast.net