Seeking a timeline of feature introductions by HP

[Andres]

The following comments are just from memory, so some may be inaccurate or incomplete, I apologize in advance for any mistake or error. Please take them just as hints, possible additions to the previous lists. I omitted most "firsts" already mentioned in previous posts.

HP 35 was the first pocket *scientific* calculator (not first pocket calculator).

TI SR 50: first angular mode selection switch.

HP 80: first financial menu for TVM, first gold shift key on a HP calculator

HP 45: first storage arithmetic, first polar/rectangular conversion, first summation and statistics, first unit conversions, first with "more than one" memory registers.

HP 65: first programmable, first magnetic card reader, first "sort of softkeys" (labels A-E and the slot to use a magnetic card to substitute key legends), first octal conversions, first looping construct (DSZ), first use of flags.

HP 55: first timer (not taking the HP 45 unofficial timer into account)

HP 25: first "engineering" notation display

HP 67: first interactive PAUSE allowing for data entry during program execution, first magnetic card MERGE function, first support for data in magnetic cards.

TI 58/59: First ROM modules as kind of application packs, first alphanumeric capability using an attached printer

HP 41: First optical wand, first "beeper", first programmable ON/OFF functions, first autoexecute flag, first flag indicators on the display, first "error ignore" flag, first display formatting (radix mark and thousands separators), first user definable keyboard mapping and support for keyboard overlays, first non-rechargeable batteries, first extended memory and functions, first time functions (HP 41 CX or Time Module) first HP-IL interface.

HP 11 and other Voyagers: First contrast adjustment, first self test on board.

HP 16: First programmers calculator with logic functions, signed integers support, word size specificatiom, etc.

HP 75: First handpulled magnetic card reader, first acoustically coupled modem.

HP 71: First IEEE 754 support for floating-point numbers.

HP 28: First graphic cursor on screen.

HP 28, 42 and/or others introduced more or less at the same time period: First infrarred printer support.