🚀 go-pugleaf

I am hoping the members of this group can help out with a postscript newbie question.

I have a need (for reasons too hilarious to go into here) to post-process Postscript output files from an application before they go to print. What I need to do is find a certain byte value (0xBA) and change it to print as a Registered Trademark symbol. I think the best way to do this is to insert an escape sequence into the operand for the ( ) show command such that the magic byte becomes a 'registered.'

I am having the devil's own time finding the right reference to how this would be constructed.

As a follow-up question, since I obviously need it, where o where is a decent online PS tutorial???

So, to clarify. What I am looking for is how to insert a character from the font BY NAME into an otherwise literal string, because the desired character happens not to be in the symbolset selected.

TIA!!
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--David Frier
  <http://www.dfconsultants.com/>