> But I believe the current hal cannot undo a linkage once set

Incorrect: There are halcmds: 'unlinkp' and 'delsig'

#-----------------------------------------------------------
$ halcmd -kf
halcmd: help
Use 'help <command>' for more details about each command
Available commands:
...
  unlinkp             Unlink pin
  newsig, delsig      Create/delete a signal


#-----------------------------------------------------------
Usage example:
   halcmd: net duh z.in0 z.in1 z.out
   halcmd: show sig duh
   Signals:
   Type          Value  Name     (linked to)
   float             0  duh
                            ==> z.in0
                            ==> z.in1
                            <== z.out
   
   halcmd: unlinkp z.in0
   halcmd: show sig duh
   Signals:
   Type          Value  Name     (linked to)
   float             0  duh
                            ==> z.in1
                            <== z.out
   
   halcmd: delsig duh
   halcmd: show sig duh
   Signals:
   Type          Value  Name     (linked to)
   
   halcmd: 
#-----------------------------------------------------------
-- 
Dewey Garrett


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