6502.org

on the OLPC wiki, there's NIP ( a b -- b ) and TUCK ( a b -- b a b ) and -ROT ( a b c -- c a b ) which I call LROT, but what is the word which has the stack diagram ( a b c -- b a c ) ? Is it UNDER?

I would be tempted to name them bca, bac, cab, and cba, but I have a perverse affinity for three-letter mnemonics.

(CAAR x) == (CAR (CAR x))
(CADR x) == (CAR (CDR x))
(CDDR x) == (CDR (CDR x))
(CDAR x) == (CDR (CAR x))

I was thinking the same thing.

Lisp actually does exactly this with CAR and CDR combinations.

Such that you have several things like: I think many have all the combinations out to 5 letters (CAAAR).

FLIP ( a b c -- b a c )
FLOP ( a b c -- c b a )

I'm going to call them FLIP and FLOP for now, until I find out what the names are supposed to be.

I think that what chitselb means is that every stack manipulation should have a name, not that every conceivable stack manipulation (no matter how rarely used) should be implemented in a Forth system. It is a simple matter to write a CODE word for any manipulation that isn't in your Forth system but is likely to be used a lot in a program. I have often found 2PICK to be such a word.

for "flop" I would probably use ROTSWAP if I needed the word or SWAPUNDER if the former name was not descriptive enough.
"flip" would probably sound better as 3REVERSE. (I hope I didn't get "flip" and "flop" mixed up. )

I have often found 2PICK to be such a word.

Is that equivalent to the phrase 2 PICK or is it a double number version of PICK ?

Mike, the TLM's you propose are valid hex numbers. Could get (a little too) interesting...

Does the ROM get copied to RAM, such that you can alter the character set? My HP-71 lets you load in different character sets, telling it what dots to turn on for each; so although it comes with the ROMAN-8 set as standard, I did the DOS/ANSI set since I now always use Epson dot-matrix printers with it.