With Peter's help I was able to get "IF" (invert flag) loaded into my 41.
Summary of results (time in seconds, benchmark code below):
Base (no modules): 1076
IR Module: 1269 (+193)
IR Module + MAN: 1269 (+193)
IR Module + MAN + MANIO: 1269 (+193)
IR Module + PRTOFF: 1094 ( +18)
Base + HP-IL (not connected): 1117 ( +41)
HP-IL (connected to printer): 1390 (+314)
HP-IL (connected to printer) + MAN: 1390 (+314)
HP-IL (connected to printer) + MAN + CF 21: 1390 (+314)
HP-IL (connected to printer) + (disable switch): 1093 ( +17)
HP-IL (connected to printer) + 55 IF: 1390 (+314)
IF does clear 55, but a second later it gets set. Clearing 15, 16, and 21 before IF does not help.
HP-IL (connected to printer) + 55 IF (in program): 1118 ( +42)
The AVIEW at the end turns on 55 and output is printed as well. The timing is a second more (due to 55 IF at start of program) than HP-IL installed but not connected to anything.
Others that are PPC ROM-less like myself can obtain high resolution scans of the PPC ROM bar codes suitable for wand input at: http://www.pahhc.org/ppccdrom.htm (PPC CD 2 V 3.01).