ACT Repair Kit Manual The new ACT Arithmetic Control Timing a new generation PMOS/NMOS circuit Repair Kit for HP-21, HP-22, HP-25, HP-25C, HP-27, HP-29C, HP-67 calculators or Upgrade Kit to HP-21E, HP-25E, HP-29E, HP-34E, HP-67E infrared printing calculators Copyright (c) PANAMATIK Bernhard Emese , April 2018, Rev. 1.14 page 1 ACT Repair Kit Manual Contents Introduction..........................................................................................................................................6 Contributions .......................................................................................................................................7 The idea of the “new ACT”..................................................................................................................8 The Repair Set......................................................................................................................................9 Replacement.......................................................................................................................................10 Preparations....................................................................................................................................11 How to open the case?...................................................................................................................11 How to unsolder ?..........................................................................................................................13 Where to place the new ACT ?......................................................................................................14 Ready to go!...................................................................................................................................15 Features...............................................................................................................................................17 1.) Revision and Serial Number.....................................................................................................18 2.) Standby Mode...........................................................................................................................18 3.) HP Logo....................................................................................................................................18 4.) External/Internal ROM.............................................................................................................19 5.) Slow/Fast Speed.......................................................................................................................19 6.) Continuous memory.................................................................................................................20 7.) Original mode...........................................................................................................................20 8.) Stopwatch.................................................................................................................................21 9.) More Program Continuous Memory........................................................................................23 10.) More Storage Continuous Memory........................................................................................23 11.) Merging Programs..................................................................................................................23 12.) Show Mantissa........................................................................................................................24 13.) Show Program Checksum......................................................................................................24 14.) Paper Advance and Available Memory..................................................................................24 15.) Repeat Function......................................................................................................................25 16.) Show XY................................................................................................................................25 17.) Show Stack.............................................................................................................................25 18) Show Registers........................................................................................................................25 19.) Show Statistical Registers......................................................................................................25 20.) Show Program steps/ Print Program.......................................................................................26 21.) Single Step Animate...............................................................................................................26 22.) Show Annunciators.................................................................................................................26 23.) Right justified entry................................................................................................................27 24.) Inserting program steps..........................................................................................................28 25.) Deleting program steps...........................................................................................................28 26.) GTO in PRGM mode..............................................................................................................29 27.) PRGM/RUN switch buttons...................................................................................................29 28.) Undo arithmetic operation......................................................................................................29 29.) Undo Program Step................................................................................................................30 30.) Hexadecimal conversion........................................................................................................30 31.) Octal conversion.....................................................................................................................30 32.) Binary conversion...................................................................................................................31 33.) PI and e...................................................................................................................................32 ROM Program collection...................................................................................................................33 1.) Load program from Library......................................................................................................34 2.) Store program to Library..........................................................................................................34 page 2 ACT Repair Kit Manual 3.) Store program to free location..................................................................................................34 4.) Load programs dynamically.....................................................................................................35 ROM Constant Collection..................................................................................................................37 List of predefined constants:..........................................................................................................37 Functions............................................................................................................................................39 1.) Show Revision and Serial Number...........................................................................................39 2.) Show Flags...............................................................................................................................39 3.) Show HP Logo..........................................................................................................................42 4.) Show ROM Code.....................................................................................................................42 5.) Show ROM Checksum.............................................................................................................43 6.) Show program checksum.........................................................................................................44 7.) Show available Memory/ Register and Program usage............................................................44 8.) Operating time and battery time...............................................................................................45 9.) Flash write Cycles....................................................................................................................46 10.) LED Test.................................................................................................................................46 11.) Welcome Message..................................................................................................................47 Multitasking........................................................................................................................................49 Flicker Supression..............................................................................................................................49 Printing with HP82240B Infrared Printer...........................................................................................52 1.) Installing the IR Diode.............................................................................................................53