Just a note to say I have experienced an issue with the HP-IL Dev+ module that seems to ignore the error ignore flag (ironic) when the HP41CX is loaded with the following modules:
HP82160A HP-IL
RAMPAGE'X/KA/BF FNS (Page 8)
WARPCORE+ (Page 9)
TOOLBOX'4/HACKER LAB (Page A)
HP82183A EXT IO (Page B)
EXT IL ROM/PRINT FCNS (Page C)
HP-IL DEV+/BS UTILS/!^C EMULTR (Page D)
I have not had time to do any detailed research as to the cause yet but when I remove these modules (bar HP82160A obvs) and replace with real HP Dev module, Flag 25 behavior returns to normal again.