Key Codes (original) (raw)
Because the older calculators could only display numbers, each key was assigned a code so that the programs could be read. The code was simple - each number represented either:
- The row and column on the keyboard. For example, the ENTER↑ key on the HP-65 would be code 41. All codes that don't start with 0 obey this rule. On the HP-97, keys on the right keypad were given codes beginning with −.
- A number. All codes starting with 0 represent the corresponding number. For example 04 means the 4 key.
The HP-55 had an exception to the above rules. GTO was displayed as a minus (−) thus GTO 25 would display as −25.
The HP-9100A & B don't use this convention. They list their keycodes on the pull-out reference card in their bases. If your card is missing, the keys are: (* marks codes/keys found only on the HP 9100B. Each of these codes can represent two functions which is determined by context. i.e. a 77 after a GO TO is a Sub not a Return.)
| Code | Key | | Code | Key | | Code | Key | | Code | Key | | ---- | --- | | ---- | --------- | | ---- | ----------- | | ---- | ----------------- | | 00 | 0 | | 20 | Clear | | 40 | y→() | | 60 | Acc+ | | 01 | 1 | | 21 | . | | 41 | Stop | | 61 | Rcl | | 02 | 2 | | 22 | Roll ↑ | | 42 | Fmt | | 62 | To Polar | | 03 | 3 | | 23 | x→() | | 43 | If Flag | | 63 | Acc- | | 04 | 4 | | 24 | y⇄() | | 44 | Go To () () | | 64 | Int x | | 05 | 5 | | 25 | ↓ | | 45 | Print/Space | | 65 | Ln x | | 06 | 6 | | 26 | Enter Exp | | 46 | End | | 66 | To Rect | | 07 | 7 | | 27 | ↑ | | 47 | Continue | | 67 | Hyper or x ←()* | | 10 | 8 | | 30 | x⇄y | | 50 | If x = y | | 70 | Sin x | | 11 | 9 | | 31 | Roll ↓ | | 51 | | | 71 | Tan x | | 12 | e | | 32 | Chg Sign | | 52 | If x<y | | 72 | Arc | | 13 | a | | 33 | + | | 53 | If x>y | | 73 | Cos x | | 14 | b | | 34 | − | | 54 | Set Flag | | 74 | ex | | 15 | f | | 35 | ÷ | | 55 | |y| | | 75 | Log x | | 16 | c | | 36 | × | | 56 | π | | 76 | √x | | 17 | d | | 37 | Clear x | | 57 | Pause | | 77 | Sub* or Return* |
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