The HP-65 and HP-67 calculators have the ability to save information onto small magnetic cards. This allows you to save and reload programs so that you don’t need to key them in again each time. With the HP-67 you can also save and reload data that is in the calculator memories.
With the emulators however, Continue reading Saving Magnetic Cards
The HP65 Emulator has a number of extra functions available. You can access these from the menu and you can get to the menu by tapping the display.
Click here on the emulator.
Then you’ll see the following:
Continue reading The HP65 Emulator Menu
When you program a programmable calculator like the HP65 you press buttons and it remembers the steps you are telling it. Then when you run the program, it re-does those button presses again to calculate the result. Every time you run the program it does those steps. This happens even though you only entered them once. That’s the point.
Internally, the calculator stores a program code for each key press or combination of key presses. With the HP65 it is mostly “one key press, one stored code” but there are a few combinations it recognises and saves as one program code. These are called “merged program steps”.
Continue reading HP65 Program Codes
This is what ends up in program memory at startup.
000: 63 =077 001: 61 =075 002: 43 =053 003: 30 =036 004: 8 =010 005: 20 =024 006: 42 =052 007: 43 =053 008: 28 =034 009: 14 =016 010: 50 =062 011: 42 =052 012: 43 =053 013: 27 =033 014: 8 =010 015: 19 =023 016: 42 =052 017: 43 =053 018: 26 =032 019: 13 =015 020: 42 =052 021: 43 =053 022: 24 =030 023: 17 =021 024: 42 =052 025: 0 026: 0
I never had a HP65 but it was what my HP67 was based on and wow it looked like a great calculator.
The keyboard layouts were very similar too.
The f, f-1, and g keys became f, g, and h.
There was extra writing added because the new g key was no longer labelled f-1 :
– on the HP65 f 9 was square root, f-1 9 was un-square root i.e. square
– on the HP67 f 9 was square root, g 9 was square
It was no longer obvious so HP added x2 next to the square root sign.
The writing also moved from above their keys to below their keys.
Aside from a few minor changes on the second row, the keys remained in familiar positions.
You can see a HP67
So, why did people upgrade from the HP65 to the HP67?
There were lots of really good things about the HP67 and just as many reasons. A couple of obvious ones were: more memory and bigger programs. But, for many, these weren’t reasons to ditch the great HP65 – merely reasons to get a HP67 too.
