With a full set of scientific functions and a whopping 550-step program memory, this is definitely a serious engineering tool.At the time, I did not yet know about the fx-4000P model number, so the find represented a bit of a mystery.At last (Well, I did have a German manual and the English manual for the EC-4020, but its not quite like the real thing.) I must say, it is still a lovely, very capable machine; my only two complaints are the somewhat hard to read display and a less than ideally robust construction.
Casio Fx 4000P Castellano Full Set OfA conditional expression is used to compute the correct result for negative arguments (the machine must be in radians mode; also note the difference between minus signs, -, and subtraction signs, ). I wonder, is the front attached with screws or glued or just double sided adhevise tape. The year is 1985. Casio released this model with an impressive set of features for its time: - Re-configurable RAM memory partitioning. Default values are 26 x 8-byte registers and 550 programming steps. Fully merged programming model. Conditional and unconditional jumps, subroutines. Support for indirect register addressing. User friendly programming environment. Calculator forensics: arcsin(arccos(arctan(tan(cos(sin(9)))))) 8.999686999 Remaining digits: 9 - Ans Exe x 10000000 31.3001 5x7 dot matrix LCD display, natural language algebraic input. Dot matrix LCD display with full contrast ON to show all elements. Casio Fx 4000P Castellano Series For AIt uses two CR2032 in series for a total of 6Volt at 1.7mA average current consumption. The issue was fixed after cleaning the battery holder connection pads on the PCA. SoC processor: Hitachi HD61747B38 6J 43 (1986 week 43) Memory: HD61914 8kbit static RAM 6K33 (1986 week 33) This is the same PCA as used on the FC-200 financial calculator, but using a different firmware. The key travel is very short and mushy, nothing compared to what we expect from a proper genuine HP machine (or from the latest SwissMicros for that matter). On the positive side, the key registration is very reliable, contrary to what some recent HP calculators like the HP-30B are doing (despite a positive mechanical action, the registration is not always reliable, be it because there are quality control issues or any other reason). It provides no tactile feedback whatsoever and the spring rate is unpleasantly non-linear, giving the feeling that the key is about to snap off at the limit of its travel. However it responds reliably and doesnt generate double presses. I think Texas scared quite a few customers off around about the time of the TI57 (and its numerous cousins rendered in similar hardware). Those were very poor units and, in the main, their leaky NiCads sent them to an early grave. Display was alpha only (no graphics) but there was a large character set. The language was not BASIC but a cleverly designed one, offering much of what to expect from a programming language. There was a hack I stumbled on accidentally some day, allowing to have both 2000 steps and the max number of memory (simply said, the pointer to the end of the program area or the beginning of the memories area was set to an impossible value which gave god mode and unprotected access to the whole memory from either perspective). Needless to say, you could be overwriting programs with the content of some memories, which unlocked hidden functions and characters such as percentages, imaginary numbers and probably more. I used this small beastie a lot at the time, and the only things I could gripe upon were that I would have loved to have a few kb more memory, and some IO to storeretrieve programs and data. The next models were a crippled version without a real programming language, just some function definition capability, or buffed up versions with more memory and display lines, but more massive already, which made them less convenient to keep in a shirt pocket. Then the graphical calculators came, but they were too bulky and contained too much useless crapware for a comfortable use outside a classroom. They could remake it the same size, with maybe a retrolit keyboard and 2-line screen allowing some pixel-level access, as well as the possiblity to read a keypress without waiting for a ENTER, some good memory amount and a SD Card reader, without sacrificing the convenience of a keyboard allowing ALPHA entry, and it would be great. There is a CASIO fx-FD10 pro model which comes very close to this, but they committed the sin of getting rid of convenient access to Alpha entry mode, as well as most key 2nd functions, in favor of a confused menu system. Casio Fx 4000P Castellano Update In TheAlthough I was quite disappointed when I discovered programming on the go is made very inconvenient, I wont resell that one, but I do hope there might be an update in the right direction some day.
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