Conversion Routine

[Dieter]

(07-02-2016 12:43 PM)SlideRule Wrote:  ...so I chose an HP-15LE. I do believe the key sequences will work (not necessarily the key codes) on an HP67, but I leave that to the audience to discover and report in their usual and thorough manner.

So let's take a closer look. ;-)

In general the code is fine, but flag 0 still is not initialized. So if the flag happens to be set when the program is run for the first time it will produce wrong results when routine B is called.

(07-02-2016 12:43 PM)SlideRule Wrote:  The listings are from an Excel spreadsheet I use to transfer RPN programs from photocopied sources to a more legible reading.
...
ps: ok here's a 67 listing

What about simple text that can be viewed without special software or downloading any attachments? Or used in emulator files.
May I humbly suggest the following version that initializes flag 0 so that both routines will run reliably? This way the CF command at the end may even be omitted.

Code:

LBL A
SF 0
GTO 0
LBL B
CF 0
LBL 0
INT
STO I
EEX
2
ENTER
1
2
F0?
X<>Y
LASTX
FRAC
*
INT
LASTX
FRAC
.
1
6
F0?
1/x
*
+
RUP
/
RCL I
+
RTN

OK, on a real 67/97 you can record the program with flag 0 cleared so that it is initialized as the card is read. ;-) On the other hand initializing the flag is essential on the 15C as its state is preserved by continuous memory. That's why I suggest an explicit CF 0 at LBL B.

Dieter