Hewlett Packard HP-10C

Serial number 2302A01578: 1983, 2nd week, America
Accessories None
Condition Good. There are many small scratches on the front alu plate and the key tops. Apparently, the unit had been carried around without being stored in a pouch. On the left side of the keyboard some aggressive solvent has damaged the silver lining a little bit.
Many small scratches on the back as well. The left two rubber feet have almost worn off completely.

Manual: HP-10C Owner's Handbook (Bound printout from the MoHPC CD-ROMs, English, 2/1982)
Repairs, Comments
Acquired 9.2.2003
Accessory
 Pouch
Acquired
 15.9.2003
.
HP codename, series "0.5", Voyager
Type, Precision, Input mode Scientific, 10 BCD digits, exponent ±99, Reverse Polish Notation.
Except for the tangent function with arguments near pi/2 the calculator exhibits superior precision!
Programmable Yes. No editing, no symbolic labels, partially merged keycodes.
Performance Index 1.6
Memory By default 10 storage registers 0-9 plus Last-x and 9 program steps (see MEM function). One storage register can be converted to 7 program steps, so there can be at most 79 program steps with no registers. Summation registers occupy register numbers 0-5. Permanent memory.
Display 10 digit 7 segment black&white LCD display plus sign
Special features
Original Pricing, Production 2.9.1982 ($80) - 1.3.1984 ($70)
Batteries 3x small button sized cells
Dimensions Length 7.9cm, Width 12.9cm, Height 1.5cm
Links HP-10C Owner's Handbook (PDF, English, 127 pages, 2/1982)
Forensic Result9.000417403
Comment Note that the HP-10C was released one year after the HP-11C as a low-cost alternative. This may explain why it is about 7% faster.

Calculation Correct result
 HP-10C Result
 Error
100/18 
40/9 
5.555555*0.5555555
 40/9+50/9000 
 sqrt(2E6)/1000
 exp(0.005) 
 exp(0.999999) 
 exp(1.000001) 
 exp(100)/1E43
 ln(1E-6)/10
 ln(0.9995)*10000 
 ln(1.0005)*10000
 pow10(0.005) 
 pow10(0.99999) 
 pow10(1.00001)/10 
 pow10(80.1)/1E80 
 log10(2E-8) 
 log10(0.9995)*10000 
 log10(1.0005)*10000 
 log10(1000100) 
 2^40 / 1E12 
2^1.443 
1.000001^1E6 
 sin(0.01 rad)*1000 
sin(1 rad)*10 
sin(1.5608 rad)*10 
sin(800 rad)*10 
tan(0.01 rad)*100 
tan(1 rad) 
tan(1.5708 rad)/1E5 
tan(800 rad) 
asin(0.01)*100,rad 
 asin(0.5)*10,rad 
 asin(0.999),rad 
 asin(0.99999),rad
 atan(0.01)*1000,rad 
 atan(0.9999)*10,rad 
 atan(1.0001)*10,rad 
 atan(1E4),rad 
 sin(0.01 deg)*10000 
sin(50 deg)*10 
sin(89.9 deg)*10 
sin(5000 deg)*10 
tan(0.01 deg)*10000 
tan(50 deg) 
tan(89.99 deg)/1000 
tan(5000 deg)*10 
asin(0.01 deg)*10 
asin(0.5 deg)/10 
asin(0.999 deg)/10 
asin(0.99999 deg)/10
atan(0.01 deg)*10 
atan(0.9999 deg)/10 
atan(1.0001 deg)/10 
atan(1E4 deg)/10
 +5.555555555 555555556
+4.444444444 444444444
+3.086419135 802500000
+4.450000000 000000000
+1.414213562 373095049
+1.005012520 859401063
+2.718279110 178575917
+2.718284546 742232836
+2.688117141 816135448
-1.381551055 796427410
-5.001250416 822979193
+4.998750416 510479141
+1.011579454 259898524
+9.999769744 141629304
+1.000023026 116026881
+1.258925411 794167210
-7.698970004 336018805
-2.172015458 642557997
+2.170929722 302082819
+6.000043427 276862670
+1.099511627 776000000
+2.718856483 813477575
+2.718280469 319376884
+9.999833334 166664683
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+9.999500371 413582332
+8.939696481 970214179
+1.000033334 666720637
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+5.235987755 982988731
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+1.566324187 113108692
+9.999666686 665238206
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+8.999427042   
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