- | Saturday, 2017-05-27T01:03:38-05:00
- Home

Questions and Answers (applies to all RPL machines) As I read through the questions and answers section of the HP48 owner's manual, I found some ommisions so I am proposing this addendum to address these. Comments and additions from others would be welcome. A: Support, Batteries, and Service ANSWERS TO COMMON QUESTIONS Q: When I press the backspace key I sometimes get an error message. A: When you press the backspace key with nothing on the command line, it performs the Drop function. Drop is a function so it requires an argument from the stack and returns no result -- thereby clearing the bottom item from the stack. So when you perform the Drop function without an argument on the stack, technically you are committing an error. Q: But sometimes I just press the backspace key out of habit before starting a new calculation. A: That isn't necessary in RPN(L). Q: Yes, but I want to anyway and what harm does it do? A: Well, it is an error to call a function without an argument, isn't it? If you really want to clear things out, press right-shift CLR, this clears the stack without returning an error when the stack is empty. Q: Why does backspace give an error if CLR doesn't? Why not just have neither one give an error? A: Because Drop is a function and functions require arguments while CLR is a command and commands don't require arguments. Q: Are you insane? A: This is a perfectly consistent approach, you're just not smart enough to appreciate it. Q: How come you can't edit equations in the Equation Writer application? A: It's an equation *writer*, not an equation *editor*. Q: Why are half the algebra functions in the Algebra menu and half in the Equation Writer? To get anything useful done I spend hours going back and forth. A: The Equation Writer isn't really done yet, it will be completed in the HP48SX's successor. Q: Will there be an upgrade option? A: No. Q: Why not? A: The same 178,000 inveterate geeks account for over 70% of our sales. If we started an upgrade plan, our dealer channel would evaporate overnight like the morning dew. Q: Whenever I store a number, it disappears just before I was about use it and then I have to leave the menu I was going to use to recall it again. A: This is normal. It is part of the HP48's elegantly consistent approach to handling functions. The STO function takes two arguments including the number to be stored. Q: Is there going to be another owner's manual? In spite of its size, this one seems oddly incomplete. A: A more complete manual was considered but dropped. Partially due to expense but mostly because market research shows that prospective buyers of pocket calculators would find a 4 volume 3600 page manual unsettling. Various geek organizations provide more detailed technical information, support, and pointless speculation about the HP48. Jeff Brown Steinmetz & Brown, Ltd. 2675 University Ave St Paul MN 55114 USA +1 612 646 2478

Areas

- hp01a (HP-01A)
- hp6s (HP6S)
- hp6ssolar (HP6S Solar)
- hp8s (HP8s)
- hp9g (HP9G)
- hp9s (HP9S)
- hp10a (HP-10A)
- hp10b (HP-10B)
- hp10bii (HP10BII)
- hp10c (HP-10C)
- hp10s (HP10s)
- hp11c (HP-11C)
- hp12bii (HP-12BII)
- hp12c (HP-12C)
- hp12cpa (HP12CPA)
- hp12cpt (HP12CPt)
- hp14b (HP14B)
- hp15c (HP-15C)
- hp16c (HP-16C)
- hp17b (HP-17B)
- hp17bii (HP17BII)
- hp17bii+ (HP17BII+)
- hp18c (HP-18C)
- hp19b (HP-19B)
- hp19bii (HP19BII)
- hp19bii+ (HP19BII+)
- hp19c (HP-19C)
- hp20s (HP-20S)
- hp21a (HP-21A)
- hp21s (HP-21S)
- hp22a (HP-22A)
- hp22s (HP-22S)
- hp25a (HP-25A)
- hp25c (HP-25C)
- hp27a (HP-27A)
- hp27s (HP-27S)
- hp28c (HP-28C)
- hp28s (HP-28S)
- hp29c (HP-29C)
- hp30s (HP30S)
- hp31e (HP-31E)
- hp32e (HP-32E)
- hp32s (HP-32S)
- hp32sii (HP32SII)
- hp33c (HP-33C)
- hp33e (HP-33E)
- hp33s (HP33S)
- hp34c (HP-34C)
- hp35a (HP-35A)
- hp35s (HP35s)
- hp37e (HP-37E)
- hp38c (HP-38C)
- hp38e (HP-38E)
- hp38g (HP38G)
- hp38g (HP38G+)
- hp39g (HP39G)
- hp39g+ (HP39G+)
- hp39gs (HP39GS)
- hp40g (HP40G)
- hp40gs (HP40GS)
- hp40g+ (HP40G+)
- hp41c (HP-41C)
- hp41cv (HP-41CV)
- hp41cx (HP-41CX)
- hp41opt1 (HP-41OPT1)
- hp42s (HP-42S)
- hp45a (HP-45A)
- hp46a (HP-46A)
- hp48g (HP48G)
- hp48gii (HP48GII)
- hp48gx (HP48GX)
- hp48g+ (HP48G+)
- hp48s (HP48S)
- hp48sx (HP48SX)
- hp49g (HP49G)
- hp49g+ (HP49G+)
- hp50g (HP50G)
- hp55a (HP-55A)
- hp56a (HP-56A)
- hp65a (HP-65A)
- hp66a (HP-66A)
- hp67a (HP-67A)
- hp70a (HP-70A)
- hp71b (HP-71B)
- hp75c (HP-75C)
- hp75d (HP-75D)
- hp80a (HP-80A)
- hp81a (HP-81A)
- hp83a (HP-83A)
- hp83f (HP-83F)
- hp85a (HP-85A)
- hp85b (HP-85B)
- hp85f (HP-85F)
- hp86a (HP-86A)
- hp86b (HP-86B)
- hp87a (HP-87A)
- hp87xm (HP-87XM)
- hp91a (HP-91A)
- hp92a (HP-92A)
- hp94d (HP-94D)
- hp94e (HP-94E)
- hp94f (HP-94F)
- hp95c (HP-95C)
- hp95lx (HP95LX)
- hp95lx1mb (HP95LX1MB)
- hp97a (HP-97A)
- hp97s (HP-97S)
- hp100lx (HP100LX)
- hp100lx2mb (HP100LX2MB)

General

- Bibliography and addresses
- HP48S* \-notation
- HP Handheld Users' Conferences
- Date of introduction
- Evolution chart
- Various feature summaries
- Information file overview
- Information summary
- HP Journal articles
- Displaying 7-segment letters
- LIF file formats
- Product numbers llist
- Names and code names
- Math problems
- Jeff Brown's additional Q&A
- RPN introduction
- Serial numbers
- Series summaries
- Solver comparison
- Blank template
- A timeline of the "firsts"
- Timing tests
- HP48SX virus
- "wall of fame."
- Wlodek Mier-Jedrzejowicz articles

Craig's Articles

- Anatomy of an Application
- An ApLet for the 38G
- The Collect-94 Development System (PDF) Datafile, Vol 11 No 3
- The Collect-94 Language (PDF) Datafile, Vol 11 No 5
- Day Number Routines Using Integer Arithmetic
- Freyja - An Emacs for the HP95LX (PDF) Datafile, Vol 11 No1
- Gotos on the HP48SX (PDF) Datafile, Vol 10 No 8
- The HP-94: A Posthumous Review
- The HP-94 Story - Audax Corporation (PDF) Datafile, Vol 11 No 6
- Initial Impressions of the Aurora FN 1000 Financial Manager
- An Inside View of HHUC-95
- Notes on the CHIP Meeting
- Notes on the 1992 HP Handheld User's Conference
- A Phase-of-the-Moon Program for the 32SII
- Some Thoughts on the HP-95LX
- Other Article List

Last modified Saturday, 2012-02-25T17:30:11-06:00.