Retro Review: BA55

02192018, 08:57 PM
Post: #1




Retro Review: BA55
Texas Instruments' entry into the programming financial calculators. Good for basic calculations and quick and simple programs, but didn't dethrone the HP 12C.
Link: http://edspi31415.blogspot.com/2018/02/r...ba55.html 

02192018, 09:34 PM
Post: #2




RE: Retro Review: BA55
This is one terrible machine. The keys are of the same mod as the TI55II and are plain AWFUL.
The BA54 came soon after and is a much better to use machine than this one. Recommend not paying any $$ for this thing. :) How do I really feel? 

02192018, 09:39 PM
Post: #3




RE: Retro Review: BA55
One other thing. The BA55 can use the PC200 printer originally aimed at the TI66.
If you have a BA55 where the keys work (as Eddie seems to have) you are very lucky! 

02192018, 10:01 PM
(This post was last modified: 02192018 10:34 PM by martinot.)
Post: #4




RE: Retro Review: BA55
(02192018 08:57 PM)Eddie W. Shore Wrote: Texas Instruments' entry into the programming financial calculators. Good for basic calculations and quick and simple programs, but didn't dethrone the HP 12C. Thanks for the great review as always Eddie. I however agree with Gene in that I think you where very lucky with the keys! When I went to school in 1985 (when I was around 16) half my class had a Casio fx180p, and the other half TI57 (I got first to use a better HP calculator three years later at high school and university). I think the TI57 is very closely realted to your financial BA55. The latter half of the class with the TI57 often swore loudly during math and physics lessons about wrong keypresses (either none, or double), and quite often also about battery contact problems, while we Casio users never had that problem (we however had to use electrical tape to keep the very poorly designed battery door and calculator together). Good times! Now to my question; why does the BA55 have an [x<>y] key, and why is the TI57 power key [y^x] instead of [x^y], as none of them are RPN calculators (like HP)? Very strange, and I can not understand why! HP 35s, HP 50g, HP Elite X3, SwissMicros DM42 

02202018, 01:41 PM
Post: #5




RE: Retro Review: BA55
The BA55 has the [x<>y] key to:
1. Allow for bivariate data entry: (x data [x<>y] y data [Σ+]) 2. In two variable statistical analysis, pressing [x<>y] switches between standard deviation of x and standard deviation of y [σn1]. This also applies for population deviation [ σn ]. 3. The key also switch operands. This could be useful in correcting the order of the arguments in subtraction and division operations. Example: I want to calculate 78  26 but enter 26  78 by mistake: 26 [  ] 78 (display: 78) [x<>y] (switches the operands, display: 26) [ = ] (result: 52, 78  26) Regarding the preference of y^x instead of x^y, I honestly have no idea. 

02202018, 01:42 PM
Post: #6




RE: Retro Review: BA55  
02202018, 09:54 PM
(This post was last modified: 02202018 10:03 PM by martinot.)
Post: #7




RE: Retro Review: BA55
(02202018 01:41 PM)Eddie W. Shore Wrote: The BA55 has the [x<>y] key to: Ahh. That explains it. Thanks! Looked very RPNlike at first. (02202018 01:41 PM)Eddie W. Shore Wrote: Regarding the preference of y^x instead of x^y, I honestly have no idea. Private guess and speculation; I wonder if they looked at HP calculators, and their buttons (it makes sense as a postpix calculator, but not as infix), but not thinking too much about it? I note that on newer TI calculator it is correctly (to be algebraic calculator) renamed to [x^y]. Trivia question: I wonder when (year? calculator model) TI changed their mind and went from printing [y^x] to [x^y] on the power key? (02192018 09:39 PM)Gene Wrote: One other thing. The BA55 can use the PC200 printer originally aimed at the TI66. Interesting! Never seen one IRL. The P200 printer, is that TI's answer to HP's 82240A/B (or perhaps vice versa if TI was first)? Is the printing technology about the same? Does it connect over IR, or some serial interface? HP 35s, HP 50g, HP Elite X3, SwissMicros DM42 

02202018, 10:46 PM
(This post was last modified: 02202018 10:47 PM by Massimo Gnerucci.)
Post: #8




RE: Retro Review: BA55
(02202018 09:54 PM)martinot Wrote: Trivia question: I wonder when (year? calculator model) TI changed their mind and went from printing [y^x] to [x^y] on the power key? Don't know about TI but HP went from x^y (HP 35) to y^x (HP 80) in 1973. Greetings, Massimo +×÷ ↔ left is right and right is wrong 

02202018, 11:06 PM
Post: #9




RE: Retro Review: BA55
What TI models have X^Y before 1990 or so?
I can't think of any. ? 

02212018, 03:00 AM
Post: #10




RE: Retro Review: BA55
I don't recall TI ever having the power key marked [x^y].


02212018, 09:02 AM
Post: #11




RE: Retro Review: BA55
(02202018 10:46 PM)Massimo Gnerucci Wrote:(02202018 09:54 PM)martinot Wrote: Trivia question: I wonder when (year? calculator model) TI changed their mind and went from printing [y^x] to [x^y] on the power key? Which makes sense (from an RPN perspective, and the order of arguments on the stack). HP 35s, HP 50g, HP Elite X3, SwissMicros DM42 

02212018, 09:11 AM
Post: #12




RE: Retro Review: BA55
(02202018 11:06 PM)Gene Wrote: What TI models have X^Y before 1990 or so? Just curious; when did they change that, even if it was after 1990? (02212018 03:00 AM)Eddie W. Shore Wrote: I don't recall TI ever having the power key marked [x^y]. I just see that on some current calculators, TI have changed from the old [y^x] button to a [X^□] button (which I think makes more sense on an algebraic calculator, if you think about the order of the arguments). Here is a comparison between the current HP calc 35s and current TI calc 36XPro: This looks very logic (to me at least) as 35s is RPN and 36X algebraic. I think I have also seen just [^] on some current graphing TI calculators, and on some others TI's the classic algebraic version [x^y] (even if I do not remember which TI models). HP 35s, HP 50g, HP Elite X3, SwissMicros DM42 

02212018, 01:18 PM
Post: #13




RE: Retro Review: BA55
Yeah, all bets are off once the TI graphing models came out with the TI80. I just don't pay much attention to any of the TI's after that :) so I don't know if they went x^y or just ^ etc. after that point.
However, before then on a nonBASIC machine, I don't know of any TI models that were X^Y. 

02212018, 01:29 PM
Post: #14




RE: Retro Review: BA55
(02212018 09:11 AM)martinot Wrote: I just see that on some current calculators, TI have changed from the old [y^x] button to a [X^□] button (which I think makes more sense on an algebraic calculator, if you think about the order of the arguments). Good catch, I missed that one, Martinot! Speaking of the TI36X Pro, what is up with the arithmetic operation keys being silver on silver? That has always bugged me on that model. 

02242018, 12:57 AM
(This post was last modified: 02242018 01:00 AM by martinot.)
Post: #15




RE: Retro Review: BA55
(02212018 01:29 PM)Eddie W. Shore Wrote:(02212018 09:11 AM)martinot Wrote: I just see that on some current calculators, TI have changed from the old [y^x] button to a [X^□] button (which I think makes more sense on an algebraic calculator, if you think about the order of the arguments). Yes. It looks like TI just used to copy some of the key labels from the HP (RPN) calculators like the [y^x] without too much thinking, and now days has changed to copy the [X^□] keys from Casio calculators (which is more appropriate for an algebraic calculator: (02212018 01:29 PM)Eddie W. Shore Wrote: Speaking of the TI36X Pro, what is up with the arithmetic operation keys being silver on silver? That has always bugged me on that model. Yes, that looks like it would be very difficult to see under less than optimal conditions. Very strange, and probably very bad, choice by TI. They can do better than that (and also does on some other of their models). HP 35s, HP 50g, HP Elite X3, SwissMicros DM42 

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