The Museum of HP Calculators

Butterworth and Chebyshev Filter Order for the HP-41C/CV/CX

This program is Copyright © HP and is used here by permission. It was originally printed in the HP-67 Filters Solution Book. This program was entered and uploaded by Tony Duell.

This program is supplied without representation or warranty of any kind. Tony Duell, Hewlett Packard and The Museum of HP Calculators therefore assume no responsibility and shall have no liability, consequential or otherwise, of any kind arising from the use of this program material or any part thereof.

Documentation Information (CD or source code)
How to get this Program to your Calculator (via HP-IL, disk, wand, and fingers)
Download Binary (.raw) program for disk or PC HP-IL Card download
Download Hexadecimal (.dat) program for Serial Port download

Program Listing

LINE  KEYS
 01 LBL "BCFORD"
 02 LBL 10
 03 LBL A
 04 XEQ 00
 05 STO 01
 06 RTN
 07 LBL 11
 08 LBL B
 09 XEQ 00
 10 STO 02
 11 RTN
 12 LBL 00
 13 10
 14 /
 15 10^X
 16 1
 17 -
 18 RTN
 19 LBL 12
 20 LBL C
 21 STO 03
 22 RCL 02
 23 RCL 01
 24 /
 25 SQRT
 26 FS? 01
 27 GTO 03
 28 XEQ 02
 29 RCL 03
 30 /
 31 XEQ 01
 32 STO 04
 33 RTN
 34 LBL 03
 35 RCL 03
 36 1/X
 37 Y^X
 38 STO 04
 39 RTN
 40 LBL 13
 41 LBL D
 42 STO 04
 43 RCL 02
 44 RCL 01
 45 /
 46 SQRT
 47 FS? 01
 48 GTO 03
 49 XEQ 02
 50 RCL 04
 51 XEQ 02
 52 /
 53 STO 03
 54 RTN
 55 LBL 03
 56 LN
 57 RCL 04
 58 LN
 59 /
 60 STO 03
 61 RTN
 62 LBL 14
 63 LBL E
 64 FS? 01
 65 GTO 03
 66 XEQ 02
 67 RCL 03
 68 *
 69 XEQ 01
 70 GTO 04
 71 LBL 03
 72 RCL 03
 73 Y^X
 74 LBL 04
 75 X^2
 76 RCL 01
 77 *
 78 1
 79 +
 80 LOG
 81 10
 82 *
 83 RTN
 84 LBL 01
 85 E^X
 86 ENTER
 87 1/X
 88 +
 89 2
 90 /
 91 RTN
 92 LBL 02
 93 ENTER
 94 X^2
 95 1
 96 -
 97 SQRT
 98 +
 99 LN
100 RTN
101 LBL 15
102 LBL a
103 SF 01
104 RTN
105 LBL 16
106 LBL b
107 CF 01
108 RTN
109 STOP
110 END

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