RPN-32 CE — Extending the HP-32E

What's been added in RPN-32 CE

For its price ($80 in 1978), the HP-32E was a remarkable calculator. It offered several statistical functions as well as hyperbolics. Conversions were available for units, decimal hours/hours.minutes.seconds and degrees/radians.

RPN-32 CE enhances the HP-32E in several ways:



Registers 15, split into R0..R8 and R.0..R.5 20, split into R0..R9 and R.0..R.9
Register Arithmetic

For STO operations only
RCL ∑+ only

For both STO and RCL operations. Includes double-register ∑+ (R.1 and R.3) working with stack registers X and Y.
Works with LSTx, e.g. RCL + yˣ

All memory contents lost on power-off

Memory contents preserved ("continuous memory")
PSE Not available Pause for 1 second
INT Not available Remove fractional part of X
FRAC Not available Remove integer part of X
RND Not available Round X to displayed value
ABS Not available Make X value positive
NOP Not available No operation
RAND Not available Create random number
GTO, GSB, RTN Not available Branching support
DSE, ISG Not available Loop control
F?, SF, CF Not available 10 flags (test, set, clear)
x=y, x<y, x>y,
x≠y, x≤y, x≥y

(double-tap to switch sets)
Not available Yes (execute next step if true, skip next step if false)
x=0, x<0, x>0,
x≠0, x≤0, x≥0

(long-press to use 0 instead of y)
Not available Yes (execute next step if true, skip next step if false)
(see "Extra Functions" at right)
Programmable Not available Yes (99 steps)
Prefix keys Active if pressed Active if pressed. Deactivated if pressed again. Indicators show state.
Register view Not available All registers shown on single screen including formatted display.
Run/Stop and single-step program without leaving register view.
Decimal Point,
Thousands separator

Fixed to "."
Thousands separator shown as comma

User-selectable representations
Command display

Not available

In program mode or while single-stepping, current command is shown as text below display
Current step display

Not available

Current program step is shown below display
Program memory fill status

Not available

Red progress bar shows amount of program memory filled

Optional programming and extra functions keys:

After double-tapping x=y:

With f prefix key active:

After double-tapping x<y:

With g prefix key active:

After double-tapping x>y:

      Getting data into RPN-32 CE
      You can preset RPN-32's registers with data created externally without having to type them in.
      Simply prepare the data in text format in any app that can handle text, like Notes, Mail and many others.
      The data format looks like this:
      Rn or R.n value (where n = 0…9)
To set R1 = 4.5, R6 = 6.28E-7, R.3 = 439, prepare your data like this:
      R1 4.5
R6 6.28e-7
R.3 439
      Select all of the text and paste.
Upper-/lower-case is ignored.
One or more blanks or tabs may follow the register number.
M may be used in place of R.
R.n may also be written as R1n, e.g. R.3 is the same as R13.
The order of the registers is irrelevant.
Unlisted registers are left untouched.

      Extra Functions
      Pauses program execution for one second.
      Sets the fractional part of x to 0.
      Sets the integer part of x to 0.
      Rounds x according to the currently shown digits.
      Sets x to the positive value of x.
      Executes a "no operation". Useful to do nothing after a test is true.
      x ≤ 0: creates an integer random number in the range 0…2^32–1.
x > 0: creates an integer random number less than x, but no larger than 2^32–1.
      GTO, GSB, RTN
      GTO nn
Continue program execution at step nn.
GSB nn
Continue program execution at step nn, remembering step nn+1.
Continue program execution at latest step remembered by GSB.

Up to 4 return addresses may be pending.
Step arguments nn of GTO and GSB are automatically adjusted when inserting or deleting steps.
      DSE, ISG
      The functions DSE (Decrement and Skip if Equal or Less) and ISG (Decrement and Skip if Greater) provide looping control by counting a value up or down, skipping the next step when a predetermined limit value has been reached.

The loop control value must be stored in register R.9, using this format:

The integer part nnnnn (up to 5 digits) is the counter value being decremented or incremented.
The fractional part xxx (exactly 3 digits) is the limit value being compared to the counter value.
The fractional part yy (exactly 2 digits) determines the amount by which the counter is incremented/decremented.

DSE decrements nnnnn by yy. If the result is equal to xxx (or less than xxx), the next step is skipped.
ISG increments nnnnn by yy. If the result is greater than xxx, the next step is skipped.

Note that xxx defaults to 000, while yy defaults to 01.
For example, the DSZ command (Decrement and Skip if Zero) found in other calculators may be emulated by simply storing the counter value n in register R.9.
      TOP, MID, END
      These keys quickly set the current step to convenient values.

Selects step 00
Selects the step halfway through the program
Selects the last program step
      F?, SF, CF
      10 flags (F0…F9) are available to be set, cleared, or tested.

F? n
Tests flag n. If it's set, program execution continues, otherwise the next step is skipped.
SF n
Set flag n.
CF n
Clear (reset) flag n.

F2 and F3 are auto-cleared on test.
In addition, F3 is auto-set by numeric user input.
All flags are cleared by executing CLEAR ALL.
      RPN-32 and RPN-38 are the only HP-simulators before the HP-15C to offer all 12 possible comparisons.
x=y, as well as x<y, x>y (using f and g)
Double-tap the operator to access additional comparisons:
x≠y, x≤y, x≥y
Single-tap the operator to select it.
Long-press the operator to replace y with 0 and select it.

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