Path: utzoo!attcan!uunet!mcsun!hp4nl!charon!cwi.nl
From: jurjen@cwi.nl (Jurjen NE Bos)
Newsgroups: comp.sys.handhelds
Subject: HP48SX funny bugs, and TRACE replacement
Message-ID: <1920@charon.cwi.nl>
Date: 2 Aug 90 14:34:44 GMT
Sender: news@cwi.nl
Organization: CWI, Amsterdam
Lines: 56

Playing with my 48, I found some bugs that I did not see reported by
others yet.

I found the following bugs on the HP48SX (version D):
Type [EQUATION] [{}] 1 / 7 + 2 [y^x] 5 + 3 -
Now type [{}] [<-].
You would expect only the - to disappear, but that doesn't happen:
It invents an entirely new formula for you.

How about this one:
Put 7 in I by 'I=7' DEF or 7 'I' STO.
Now watch the difference between
'N' {N I} | (giving 'I', wich is wrong), and
'N*1' {N I} | (giving the correct answer 7).
Why does | forget to evaluate?

A not so serious one, but it is still a bug:
Type [EQUATION] to get into the equationWriter, and type (2+3 [triangle <-]
now you can go all the way to the left by [blue-shift] [triangle <-], but
you cannot reach this location by repeated [triangle <-].  The rules act as
if the + is selected.

If you want to use the equivalent of TRACE on the 28, you can use the
the vectored ENTER to help you.
Enter the programs:
alphaENTER (25.5 bytes, #CA4Dh)
\<< PR1 OBJ\-> \>>
and
betaENTER (118.5 bytes, #F6B1h)
\<<
  IF DUP "" ==
  THEN DROP "?"
  END 'KEY' \->TAG PR1 DROP
  IF DEPTH
  THEN DUP 1 \->TAG
  ELSE "[Empty Stack]"
  END PR1 DROP
\>>

Set flags -62 (user mode) and -63 (vectored ENTER). Make sure the output
is sent to the right port (printer to IR or wire).
Maybe you want to set -61 (USER toggle) to switch in and out USER mode
more quickly.
Watch out if you use USER key assignments.
A tip:
execute {STO 32.1 PURGE 54.2} STOKEYS so that STO and PURGE get a message when
typed (Yes, this is another bug.  It is a result of the fact that the keys
differ from their commands (the keys save the old contents in LASTARG)).


Happy playing,	Jurjen
--
|                 | "Never imagine yourself not to be otherwise than what |
| Jurjen N.E. Bos | it might appear to others that what you were or might |
|                 | have been was not otherwise than what you had been    |
|  jurjen@cwi.nl  | would have appeared to them to be otherwise."         |