The HP-11C was the second most powerful member of Hewlett-Packard's Voyager series of calculators, second only to the HP-15C. Like its bigger cousin, the HP-11C is a highly versatile, pleasant to use calculator. I can only repeat myself: it's a real pity that this series of calculators (with the sole exception of the HP-12C) is no longer in production.

Just as one would expect from a high-end scientific calculator, the HP-11C has even a built-in implementation of the Gamma function (or, to be precise, its built-in factorial function is a generalized factorial, yielding results for all real arguments.) This makes the writing of a Gamma function program an exercise in redundancy. On the other hand, I didn't really have to write one new, since the program I wrote for the HP-15C could be easily converted. Of course on the HP-11C it is no longer capable of handling complex arguments, but it can still serve as a useful demonstration of this calculator's capabilities.

001 -	42,21,11	LBL A
002 -	 1		1
003 -	34		x-y
004 -	42,21, 2	LBL 2
005 -	43,20		x>0
006 -	22  1		GTO 1
007 -	36		ENTER
008 -	33		Rv
009 -	20		×
010 -	43 33		R^
011 -	 1		1
012 -	40		+
013 -	22  2		GTO 2
014 -	42,21, 1	LBL 1
015 -	44  1		STO 1
016 -	34		x-y
017 -	44  0		STO 0
018 -	 7		7
019 -	 6		6
020 -	48		.
021 -	 1		1
022 -	 8		8
023 -	 0		0
024 -	 0		0
025 -	 9		9
026 -	 1		1
027 -	 7		7
028 -	 3		3
029 -	45  1		RCL 1
030 -	 1		1
031 -	40		+
032 -	10		÷
033 -	 8		8
034 -	 6		6
035 -	48		.
036 -	 5		5
037 -	 0		0
038 -	 5		5
039 -	 3		3
040 -	 2		2
041 -	 0		0
042 -	 3		3
043 -	 3		3
044 -	45  1		RCL 1
045 -	 2		2
046 -	40		+
047 -	10		÷
048 -	30		-
049 -	 2		2
050 -	 4		4
051 -	48		.
052 -	 0		0
053 -	 1		1
054 -	 4		4
055 -	 0		0
056 -	 9		9
057 -	 8		8
058 -	 2		2
059 -	 4		4
060 -	45  1		RCL 1
061 -	 3		3
062 -	40		+
063 -	10		÷
064 -	40		+
065 -	 1		1
066 -	48		.
067 -	 2		2
068 -	 3		3
069 -	 1		1
070 -	 7		7
071 -	 3		3
072 -	 9		9
073 -	 5		5
074 -	 7		7
075 -	 2		2
076 -	45  1		RCL 1
077 -	 4		4
078 -	40		+
079 -	10		÷
080 -	30		-
081 -	 1		1
082 -	48		.
083 -	 2		2
084 -	 0		0
085 -	 8		8
086 -	 6		6
087 -	 5		5
088 -	 0		0
089 -	 9		9
090 -	 7		7
091 -	 4		4
092 -	26		EEX
093 -	 3		3
094 -	16		CHS
095 -	45  1		RCL 1
096 -	 5		5
097 -	40		+
098 -	10		÷
099 -	40		+
100 -	 5		5
101 -	48		.
102 -	 3		3
103 -	 9		9
104 -	 5		5
105 -	 2		2
106 -	 3		3
107 -	 9		9
108 -	 3		3
109 -	 8		8
110 -	 5		5
111 -	26		EEX
112 -	 6		6
113 -	16		CHS
114 -	45  1		RCL 1
115 -	 6		6
116 -	40		+
117 -	10		÷
118 -	30		-
119 -	 1		1
120 -	40		+
121 -	43 26		π
122 -	 2		2
123 -	20		×
124 -	11		√
125 -	20		×
126 -	45  1		RCL 1
127 -	10		÷
128 -	43 12		LN
129 -	45  1		RCL 1
130 -	 5		5
131 -	48		.
132 -	 5		5
133 -	40		+
134 -	43 12		LN
135 -	45  1		RCL 1
136 -	48		.
137 -	 5		5
138 -	40		+
139 -	20		×
140 -	40		+
141 -	45  1		RCL 1
142 -	30		-
143 -	 5		5
144 -	48		.
145 -	 5		5
146 -	30		-
147 -	12		ex
148 -	45  0		RCL 0
149 -	10		÷
150 -	43 32		RTN