Here is a program that I wrote several years ago and just found recently. I posted it to the museum curator, but it has not been posted in the programs section yet.

Best Wishes all,

Glenn

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Program for the HP 33E and HP-33C

HEX to DECIMAL

DECIMAL to HEX

by: Glenn Hayhurst - Longmont CO

This program will convert DECIMAL numbers

in the range of 0-65535 to their HEX

equivalents.

It will also convert HEX numbers in the

range of 0-FFFF to their DECIMAL equivalents.

Program Listing

Key Display

_______________

ENTER 01-31

RCL 5 02-24 5

/ 03-71

g INT 04-32

STO 1 05-23 1

RCL 5 06-24 5

* 07-61

- 08-41

ENTER 09-31

ENTER 10-31

RCL 6 11-24 6

/ 12-71

g INT 13-15 32

STO 2 14-23 2

RCL 6 15-24 6

* 16-61

- 17-41

ENTER 18-31

ENTER 19-31

RCL 7 20-24 7

/ 21-71

g INT 22-15 32

STO 3 23-23 3

RCL 7 24-24 7

* 25-61

- 26-41

g INT 27-15 32

STO 0 28-23 0

RCL 1 29-24 1

f PAUSE 30-14 74

RCL 2 31-24 2

f PAUSE 32-14 74

RCL 3 33-24 3

f PAUSE 34-14 74

RCL 0 35-24 0

GTO 00 36-13 00

RCL 1 37-24 1 <-Entry point for H>D conversion

RCL 5 38-24 5

* 39-61

STO + 0 40-23 51 0

RCL 2 41-24 2

RCL 6 42-24 6

* 43-61

STO + 0 44-23 51 0

RCL 3 45-24 3

RCL 7 46-24 7

* 47-61

STO + 0 48-23 51 0

RCL 0 49-24 0

-------------------

Enter the program, then store these three

values that are used in the calculations.

4096 STO 5

256 STO 6

16 STO 7

-------------------

Before running the program for the first

time, hit g RTN. This sets the program

to step 00.

-------------------

Example:

To convert from DECIMAL to HEX:

43961 ENTER (stores value in Y register)

R/S (run program)

The display will pause with four numbers.

These numbers appear in the order of the

hex value.

10 11 11 9 (Display shows)

A B B 9 (Hex Value)

--------------------

Example:

To convert from HEX to DECIMAL:

Store the hex values in the following

registers.

I.E. ( HEX ) A B B 9

(DEC equiv) 10 11 11 9

10 STO 1

11 STO 2

11 STO 3

9 STO 0

Then: GSB 37 (entry point for H>D conversion)

The program will run converting the values stored

in registers 1, 2, 3, 0 to a decimal value that is

left in the X register (display).

Answer: 43961

--------------------

Number conversion table:

HEX DECIMAL

--- -------

0 0

1 1

2 2

... ...

9 9

A 10

B 11

C 12

D 13

E 14

F 15

--------------------

Registers used:

R0 HEX digit

R1 HEX digit

R2 HEX digit

R3 HEX digit

R4 unused

R5 4096 fixed value for program

R6 256 fixed value for program

R7 16 fixed value for program

*Edited: 3 May 2006, 10:12 a.m. after one or more responses were posted*