Casio fx-201p Programmable Calculator from 1976 

Sounds interesting. Does Menadue have a website? can you post a link?

Let’s try again on the url. It seems you might have url turned off for your reply section. Here is the card guy Menadue: “youtu. be / 1NByD6thetA” Remove the spaces. Cheers, Geoff Just retired as an airline pilot (Jan 1/23) and my last flight was to Aukland from Vancouver and return. That was my first international flight in 1988. Love New Zealand.

@@geoffquickfall there is so setting that I know of - RU-vid disallows most URLs in comments for anti spam/scam reasons.

@@CalculatorCulture: probably not, the algorithm does expect a space after a period “.” If it does not see a space it treats the rest of the letters as a URL. Anyhow, glad we got around it ;-) cheers, Geoff

@@CalculatorCulture Here I am...

Yeah if you have a table of numbers that you need to perform the same operation on the constant operation is useful. I guess would have been more common in the days before computer spreadsheets.

Yeah, there is also the fx-3650p II from around 2013 which seems to be available in a few places like Hong Kong and Japan. I managed to find one recently and will make a video about it at some point.

I’m not sure actually. I haven’t been able to find it either.

Isn't it a connector for program cartridges, like on a TI-95?

True, it may have shared the same circuit board with the PRO fx-1, although the carder read on that was at the top of the device. If that is the case is it still odd they put an access panel in the body of the calculator. It is as if they planned for a future pluggable peripheral that was never released.

​@@watchmakerful could be.

The edge connector on the FX202P has mainly address lines on it, I haven't looked at the FX201P yet but I suspect it is very similar. I have looked at the internal program representation of the FX201P by replacing the HD36106 memory ICs with a raspberry Pi Pico. That gives you flash storage in the RP2040 flash and a USB interface. 1 Pin 6 HD36106 (CLKB) 2 Pin 15 T5006P (DIN) 3 nc (connected to a signal on the FX-201P) 4 Pin 16 TC5006P (5V) 0V on calculator 5 Pin 8 HD36106 (0V) 6 Pin 4 TC5006P A1 7 Pin 6 TC5006P A4 8 A9 9 A8 10 A7 11 A6 12 A5 13 A2 14 A0 15 A3 16 nc 17 nc

Yeah great questions - there is an explanation of both in the note 1 and note 2 below the listing here: community.casiocalc.org/topic/3902-the-n-queens-problem-on-a-casio-fx-201p-8-queens/

Yeah, it is quite wasteful of space. They did move to more of an efficient keystroke programming model in the fx-501p/fx-502p

The PRO-101 does have over twice as many steps as the MK-61, though, and they are non-volatile. You could put the parameters in memories and leave the results there too and save some steps. The PRO-101 uses colons to separate statements, which does use a lot of steps up. I suspect that when they decided to go for the 'Fortran' language they had to put the colons in to help with problems like deciding what the '3' is in the following: ENT 1 : 2 : 3 as it could be either: ENT 1 : 2 : 3 = 1 or ENT 1 : 2 : 3 : 2 = 1 You need to check for either '=' or ':' to know what the statement is. the colon actually helps a bit there.

True, with a four register stack it would have been easier to use.