Hewlett Packard HP-75C/D


Serial number HP-75C 2314A10247: 1983, 14th week, America
Accessories Big & sturdy leather box for the HP-75C plus a stick of magnetic cards

Keyboard overlay set, part no. 7121-3581: 3 empty overlays, one for numeric input, one with special characters

Classic-style battery pack, operational

220V AC power supply, output DC 8V, 3W

Manual: HP-75 Benutzerhandbuch (German), dated October 1982

Manual: HP-75 Referenzhandbuch (German), dated October 1982

HP-IL cable

2 magnetic card holders

Magnetic cards:
Namen Benutzerpaket, 1982, 00075-82030 Ausg.A
Finanz Benutzerpaket, 1982 00075-82024 Ausg.A
Budget Worksheet, 1983, 00075-82284 Rev.A
IRR Extension Function, 1983, 00075-82285 Rev.A
Aufgpst Benutzerpaket, card 1-4, 1982, 00075-82026, Ausg.A
Approx. 60 general purpose card, paritally used

8kByte RAM module, part no. 82700A, serial no. 2324A10333

Manual: HP 82700A 8K Memory Module Multilingual Instructions (various languages), dated Feb 1983

Software version is "aaaaaa" (use VER$ command)
Condition Absolutely excellent! Almost no scrathes on the front or back.
Repairs, Comments -
Acquired 23.2.2003




Serial number HP-75D 2440A07802: 1984, 40th week, America
Accessories Power supply 82059D, input 110V AC

HP 82718A Opt 64 modem & RAM expansion pod.
Serial number 2452A60060 OPT# 064, made in USA, 1984

HP 92267B barcode reader wand

8kByte RAM module

Software version is "bbbbbb" (use VER$ command)

Manual: HP 82718A Expansion Pod Reference Manual (English, PDF), July 1984, 123 pages, bound printout from the MoHPC CD-ROM
Condition Calculator: Excellent!

Expansion pod: Good, some scratches on the front and significant scratches on the back. Rubber feet ok.
Repairs, Comments 17.6.2003 Temporarily removed HP-75D from pod.
Important: It seems that the modem draws a lot of current when turned on. Neither my 220V 3W power supply nor the 110V 7W power supply can provide enough current so that when issuing the "MODEM ON" command the unit will loose all power and memory contents and turn off! Only with installed battery packs does the "MODEM ON" command work.
The bar code read does work without batteries.
Acquired 5.6.2003
.
HP codename, series Kangaroo, series unknown
Type, Precision, Input mode Scientific, 12 BCD digits, exponent 499, Algebraic.
Delivers very accurate results, see table below.
Programmable Yes, BASIC interpreter
Performance Index 69. This is outstanding considering the introduction date of 1982.
Memory 14271 bytes, 22463 bytes with the 8K RAM module installed, returned by MEM command.
65492 bytes in the pod's memory, returned by XMEM command.
Permanent memory.
Display 32 digit 5x7 pixel black&white LCD, contrast not adjustable
Special features HP-IL module and magnetic card reader built-in. The card-reader must be opeated manually.
Original Pricing, Production 15.9.1982 ($995) - 1.5.1984 ($995)
Batteries Classic-style battery pack with 3x AA cells. Or external DC 8V power supply with special connector.
The expansion pod is powered from the calculator when using an external power supply.
Alternatively, two Classic-style battery packs can be installed in the expansion pod.
Dimensions Length 12.7cm, Width 25.7cm, Height 3cm

Expansion pod: Length 16.3cm, Width 29.1cm, Height 5.6cm
Links HP-75 Owner's Manual (English, PDF), Nov 1982, 347 pages
Reverse Engineering the HP-75C.
HP 82718A Expansion Pod Quick Reference.
HP 82718A Expansion Pod Reference Manual (English, PDF), July 1984, 123 pages
HP-IL Info (Dan McDonald)
HP41.org/HPIL (HP-IL Information including manuals)
Comment HP's first BASIC-programmable unit.
To turn on press ATTN, to turn off press SHIFT-ATTN.
After a loss of power press EDIT to get rid of date/time entry.
For normal programming and program execution use the EDIT mode.
The HP-75D has an interface for an optical bar-code reader built in and was shipped with a wand.
I've seen software version numbers "aaaaaa", "bbbbbb" and "dddddd".

Calculation
Correct result
HP-75C 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 
+5.55555555555 5555556
+4.44444444444 4444444
+3.08641913580 2500000
+4.45000000000 0000000
+1.41421356237 3095049
+1.00501252085 9401063
+2.71827911017 8575917
+2.71828454674 2232836
+2.68811714181 6135448
-1.38155105579 6427410
-5.00125041682 2979193
+4.99875041651 0479141
+1.01157945425 9898524
+9.99976974414 1629304
+1.00002302611 6026881
+1.25892541179 4167210
-7.69897000433 6018805
-2.17201545864 2557997
+2.17092972230 2082819
+6.00004342727 6862670
+1.09951162777 6000000
+2.71885648381 3477575
+2.71828046931 9376884
+9.99983333416 6664683
+8.41470984807 8965067
+9.99950037141 3582332
+8.93969648197 0214179
+1.00003333466 6720637
+1.55740772465 4902231
-2.72241808407 3540959
-1.99490016084 5839293
+1.00001666741 6711313
+5.23598775598 2988731
+1.52607123962 6163188
+1.56632418711 3108692
+9.99966668666 5238206
+7.85348160897 3649763
+7.85448160897 5316429
+1.57069632679 5229953
+1.74532924313 3368033
+7.66044443118 9780352
+9.99998476913 2876988
-6.42787609686 5393263
+1.74532926971 6252907
+1.19175359259 4209959
+5.72957789313 0590236
-8.39099631177 2800118
+5.72967344857 1526491
+3.00000000000 0000000
+8.74374412668 7686209
+8.97437652708 4057279
+5.72938697683 4859268
+4.49971350677 8012245
+4.50028646457 4097998
+8.99942704220 6779036
+5.55555555556
+4.44444444444
+3.08641913580
+4.45000000000
+1.41421356237
+1.00501252086
+2.71827911018
+2.71828454674
+2.68811714182
-1.38155105580
-5.00125041682
+4.99875041651
n/a
n/a
n/a
n/a
-7.69897000434
-2.17201545864
+2.17092972230
+6.00004342728
+1.09951162778
+2.71885648381
+2.71828046932
+9.99983333417
+8.41470984808
+9.99950037141
+8.93969648197
+1.00003333467
+1.55740772465
-2.72241808361
-1.99490016084
+1.00001666742
+5.23598775598
+1.52607123963
+1.56632418711
+9.99966668667
+7.85348160897
+7.85448160898
+1.57069632680
+1.74532924313
+7.66044443119
+9.99998476913
-6.42787609687
+1.74532926972
+1.19175359259
+5.72957789313
-8.39099631177
+5.72967344857
+3.00000000000
+8.74374412669
+8.97437652708
+5.72938697683
+4.49971350678
+4.50028646457
+8.99942704221

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0
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0
0
0
0
0
0
0
0
0
0
0
46E-9
 1E-9
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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