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TI-59 most keypresses for a single instruction - Gene - 12-14-2017 03:19 AM
"The more flexible storage format for programs in the TI-59 allowed combining more keys into one instruction. The longest instruction required eleven keypresses, re-using the shift keys four times."
The above is from: http://www.like2do.com/learn?s=HP-41
I am trying to think what this would be. INV 2ND PROD 01 is five keystrokes but takes two steps.
Any ideas or is this a mistake above.
RE: TI-59 most keypresses for a single instruction - Thomas Okken - 12-14-2017 03:26 AM
Add "ind" and you're up to 7 keystrokes: INV 2nd Prod 2nd Ind 0 0
But 11 keystrokes for one command? *headscratch*
RE: TI-59 most keypresses for a single instruction - Thomas Okken - 12-14-2017 03:44 AM
INV 2nd If_Flg 2nd Ind 0 0 2nd Ind 0 1
If the flag pointed to by register 00 is not set, jump to the line pointed to by register 01.
RE: TI-59 most keypresses for a single instruction - Gene - 12-14-2017 04:04 AM
That may be it, Thomas, but I think that occupies two program steps.
RE: TI-59 most keypresses for a single instruction - Thomas Okken - 12-14-2017 04:24 AM
Six, actually:
INV
2nd If_Flg
2nd Ind
00
2nd Ind
01
But it's still one *instruction*.
RE: TI-59 most keypresses for a single instruction - Gene - 12-14-2017 04:38 AM
Oops. You are quite correct of course. Apologies.
I think we found it.
If there were ever an illustration of why the HP 41 was so much easier / (ahem) better than the TI-59 style approach, this is it.
Well, and using INV x-bar for standard deviation. That's pretty bad too. :-)
ty for clearing up the mystery for me.
RE: TI-59 most keypresses for a single instruction - Thomas Okken - 12-14-2017 04:56 AM
My pleasure! I've always had a soft spot for the TI-58/59, because of their raw power.
But there is a lot to be said for
FC? IND 00
GTO IND 01
Which is four bytes,
rather than
22
87
40
00
40
01
which takes up more memory and is harder to read. :-)
RE: TI-59 most keypresses for a single instruction - Dave Britten - 12-21-2017 01:14 AM
(12-14-2017 04:56 AM)Thomas Okken Wrote: My pleasure! I've always had a soft spot for the TI-58/59, because of their raw power.
The 59 certainly outdid the 67 in programming capability, even if not hardware quality. The 41C, of course, trounced them both, but TI's 95 compares very favorably to the 41 and 42 (despite its ridiculous size).
(12-14-2017 04:56 AM)Thomas Okken Wrote: But there is a lot to be said for
FC? IND 00
GTO IND 01
Counting keystrokes, you've got "Shift FLAGS [FC?] . 0 0 Shift GTO . [IND] 0 1". So that's 12, to the 59's 11!
RE: TI-59 most keypresses for a single instruction - Thomas Okken - 12-21-2017 02:29 AM
(12-21-2017 01:14 AM)Dave Britten Wrote:(12-14-2017 04:56 AM)Thomas Okken Wrote: But there is a lot to be said for
FC? IND 00
GTO IND 01
Counting keystrokes, you've got "Shift FLAGS [FC?] . 0 0 Shift GTO . [IND] 0 1". So that's 12, to the 59's 11!
The HP-41 doesn't have menus, so it's XEQ ALPHA F C ? ALPHA instead of Shift FLAGS FC?, for a total of 15 keystrokes. But I was referring to the 41 version being easier to read.
RE: TI-59 most keypresses for a single instruction - Massimo Gnerucci - 12-21-2017 09:13 AM
(12-21-2017 02:29 AM)Thomas Okken Wrote:(12-21-2017 01:14 AM)Dave Britten Wrote: Counting keystrokes, you've got "Shift FLAGS [FC?] . 0 0 Shift GTO . [IND] 0 1". So that's 12, to the 59's 11!
The HP-41 doesn't have menus, so it's XEQ ALPHA F C ? ALPHA instead of Shift FLAGS FC?, for a total of 15 keystrokes. But I was referring to the 41 version being easier to read.
Shift GTO . Σ+
11, on par!
RE: TI-59 most keypresses for a single instruction - Dave Britten - 12-21-2017 12:08 PM
(12-21-2017 02:29 AM)Thomas Okken Wrote: The HP-41 doesn't have menus, so it's XEQ ALPHA F C ? ALPHA instead of Shift FLAGS FC?, for a total of 15 keystrokes.
Oh yeah, forgot FC? wasn't on the keyboard.
(12-21-2017 02:29 AM)Thomas Okken Wrote: But I was referring to the 41 version being easier to read.
Yup, no argument there. (But the TI-66 comes close to bridging the gap, and the TI-95 isn't too shabby either.)
RE: TI-59 most keypresses for a single instruction - rprosperi - 12-21-2017 02:20 PM
(12-21-2017 09:13 AM)Massimo Gnerucci Wrote: Shift GTO . Σ+
11, on par!
My hero!!!
Thanks Massimo for restoring the 41C's honor. That was a close call...
RE: TI-59 most keypresses for a single instruction - Thomas Okken - 12-21-2017 02:56 PM
(12-21-2017 02:20 PM)rprosperi Wrote:(12-21-2017 09:13 AM)Massimo Gnerucci Wrote: Shift GTO . Σ+
11, on par!
My hero!!!
Thanks Massimo for restoring the 41C's honor. That was a close call...
I'm aftraid not, we haven't been counting very accurately...
HP-41: XEQ ALPHA F C ? ALPHA Shift 0 0 Shift GTO Shift Σ+
13 keystrokes
HP-42S: Shift FLAGS FC? . 0 0 Shift GTO . IND 0 1
12 keystrokes
Compliments to Massimo for using Σ+ as a shortcut for 01. It's been so long since I've used a 41 I had completely forgotten about that!
RE: TI-59 most keypresses for a single instruction - rprosperi - 12-21-2017 07:27 PM
(12-21-2017 02:56 PM)Thomas Okken Wrote: I'm aftraid not, we haven't been counting very accurately...
HP-41: XEQ ALPHA F C ? ALPHA Shift 0 0 Shift GTO Shift Σ+
13 keystrokes
HP-42S: Shift FLAGS FC? . 0 0 Shift GTO . IND 0 1
12 keystrokes
Compliments to Massimo for using Σ+ as a shortcut for 01. It's been so long since I've used a 41 I had completely forgotten about that!
But... If I have FC? assigned to an un-shifted key, say [TAN], then it's
HP-41: TAN Shift 0 0 Shift GTO Shift Σ+
8 keystrokes
and before anyone decries this a foul or cheating, recall that the entire point of key assignments was to reduce keystrokes, so if this were being done often (which almost certainly it isn't) the assignment would save 5 keystrokes every time.
As it seems this thread has devolved to which is more key-efficient, and the 58/59 series don't support non-program key assignments (he thinks...), I have to say the 41C wins again. YMMV.
RE: TI-59 most keypresses for a single instruction - Gene - 12-21-2017 07:37 PM
Using synthetic programming, I think you can assign the entire instruction to a key.
RE: TI-59 most keypresses for a single instruction - rprosperi - 12-21-2017 08:09 PM
(12-21-2017 07:37 PM)Gene Wrote: Using synthetic programming, I think you can assign the entire instruction to a key.
I initially didn't think you could include prompting commands (e.g. FC? prompts for which flag (or indirect) to test), but the byte table does include them, so AD 80 1D 81 should do it.
So yeah, 1 keystroke. (sorry, no emoji for mind blown)
RE: TI-59 most keypresses for a single instruction - Thomas Okken - 12-21-2017 08:17 PM
(12-21-2017 08:09 PM)rprosperi Wrote: (sorry, no emoji for mind blown)
U+1F92F
Probably requires a MyBB update for it to work here.
RE: TI-59 most keypresses for a single instruction - Dieter - 12-21-2017 08:56 PM
(12-14-2017 04:38 AM)Gene Wrote: I think we found it.
Sure?
Didn't the quote in your initial post say ..."re-using the shift keys four times." ?-)
Dieter
RE: TI-59 most keypresses for a single instruction - Thomas Okken - 12-21-2017 09:17 PM
(12-21-2017 08:56 PM)Dieter Wrote:(12-14-2017 04:38 AM)Gene Wrote: I think we found it.
Sure?
Didn't the quote in your initial post say ..."re-using the shift keys four times." ?-)
"Shift keys" (note the plural) presumably refers to 2nd and INV.
In case you disagree, I'm looking forward to seeing another 11-keystroke instruction, which does involve pressing 2nd four times.