The Museum of HP Calculators

Butterworth or Chebyshev Filter Design Input 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 E.E. Pac 1. This program was ported to the HP-41C by reading with the HP-41C card reader and the card reader may be required for operation of this program. 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 "BCF67I"
 02 LBL 14
 03 LBL E
 04 10
 05 /
 06 10^X
 07 2
 08 *
 09 1
 10 -
 11 LN
 12 STO 21
 13 X<>Y
 14 XEQ 09
 15 XEQ 07
 16 RCL 21
 17 X<>Y
 18 LN
 19 ABS
 20 /
 21 1
 22 +
 23 2
 24 /
 25 INT
 26 STO 24
 27 RTN
 28 LBL 10
 29 LBL A
 30 STO 05
 31 RTN
 32 LBL 13
 33 LBL D
 34 10
 35 /
 36 10^X
 37 1
 38 -
 39 4
 40 *
 41 RCL 06
 42 X^2
 43 /
 44 2
 45 -
 46 STO 21
 47 X<>Y
 48 XEQ 09
 49 XEQ 07
 50 ENTER
 51 X^2
 52 1
 53 -
 54 SQRT
 55 +
 56 STO 03
 57 LN
 58 RCL 21
 59 LN
 60 X<>Y
 61 /
 62 STO 24
 63 LBL 06
 64 RCL 24
 65 RCL 03
 66 RCL 24
 67 Y^X
 68 STO 20
 69 ENTER
 70 1/X
 71 +
 72 RCL 21
 73 -
 74 RCL 20
 75 ENTER
 76 1/X
 77 -
 78 /
 79 RCL 03
 80 LN
 81 /
 82 2
 83 /
 84 -
 85 STO 24
 86 LASTX
 87 ABS
 88 .01
 89 X<=Y?
 90 GTO 06
 91 RCL 24
 92 2
 93 /
 94 1
 95 +
 96 INT
 97 STO 24
 98 RTN
 99 LBL 09
100 2
101 *
102 PI
103 *
104 RTN
105 LBL 07
106 STO 20
107 RCL 23
108 STO 25
109 7GTOI
110 LBL 04
111 XEQ 03
112 GTO 00
113 LBL 02
114 XEQ 01
115 LBL 00
116 1/X
117 CHS
118 GTO 05
119 LBL 01
120 RCL 20
121 RCL 07
122 /
123 GTO 05
124 LBL 03
125 RCL 20
126 X^2
127 RCL 07
128 X^2
129 -
130 RCL 20
131 /
132 RCL 08
133 /
134 LBL 05
135 ABS
136 STO 22
137 RTN
138 LBL 18
139 LBL d
140 STO 04
141 10
142 /
143 10^X
144 1
145 -
146 SQRT
147 STO 06
148 RTN
149 LBL 16
150 LBL b
151 2
152 GTO 00
153 LBL 17
154 LBL c
155 3
156 GTO 01
157 LBL 12
158 LBL C
159 4
160 LBL 01
161 XEQ 00
162 RDN
163 XEQ 09
164 STO 08
165 RTN
166 LBL 11
167 LBL B
168 1
169 LBL 00
170 STO 23
171 RDN
172 XEQ 09
173 STO 07
174 RTN
175 STOP
176 END

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