Here is a partial list of patents relating to HP calculators. In the first
column I've
entered the number of pages. The short ones aren't too interesting. The
following
relate to specific machines although I'm not too sure about the 9805.
US4437156 (334 pages) HP9825 Processor description (No firmware)
US4180854 (575 pages) HP9845 Description (No firmware)
US4158285 (149 pages) wristwatch calculator
US4089059 (375 pages) HP9815 Processor description and firmware listing
US4075679 (599 pages) HP9825 Processor description and firmware listing
US4012725 (589 pages) HP9830 Processor description and firmware listing
US3971925 (162 pages) HP9805 Processor description and firmware listing
US3839630 (389 pages) Unknown
Also US4172281 Microprogrammable Control Processor for a Minicomputor or the
like
(125 pages) gives a description and schematic for a 16 bit TTL machine. Uses
74S181s
in the ALU and reference is made to the HP21XX in the opcode listing.
Unfortunately the quality of the copy is poor and there is no microcode.
Downloaded from
http://gb.espacenet.com.
Chris
Pages Patent No Issued Title
011 US05530234 06/25/1996 Hand held calculator having a retractable cover
021 US04885714 12/05/1989 Calculator having a user-accessible object stack
for the uniform application of mathematical functions and logical operations
to a multiplicity of object types
030 US04821228 04/11/1989 Method and apparatus for computation stack
recovery in a calculator
010 US04566072 01/21/1986 Programmable calculator including means for
digitizing the position of an X-Y plotter pen
011 US04546448 10/08/1985 Programmable calculator including program variable
initialization means and definition means array
031 US04480305 10/30/1984 Programmable calculator including editing
capability
019 US04456964 06/26/1984 Calculator including means for displaying
alphanumeric prompting messages to the operator
010 US04455618 06/19/1984 Programmable calculator
026 US04455607 06/19/1984 Programmable calculator having keys for
performing angular measurement unit conversion
334 US04437156 03/13/1984 Programmable calculator
031 US04412300 10/25/1983 Programmable calculator including alphabetic
output capability
026 US04384328 05/17/1983 Programmable calculator including magnetic reading
and recording means
030 US04381554 04/26/1983 Calculator for storing source data and evaluating
numerical answers to problems
007 US04330839 05/18/1982 Programmable calculator including means for
automatically processing imformation stored on a magnetic record member
012 US04322816 03/30/1982 Programmable calculator having structure for
controlling an x-y plotter
031 US04309761 01/05/1982 Calculator for evaluating numerical answers to
problems
029 US04291385 09/22/1981 Calculator having merged key codes
018 US04281390 07/28/1981 Programmable calculator including means for
performing computed and uncomputed relative branching during program execution
003 USD0256133 07/29/1980 Casing for an electronic calculator
031 US04203152 05/13/1980 Programmable calculator including key-log
printing means
030 US04198684 04/15/1980 Electronic calculator with keyboard-controlled
unary function capability
010 US04197586 04/08/1980 Electronic calculator assembly
019 US04187547 02/05/1980 Programmable calculator including means for
controllably introducing blank lines on a printed record during program
execution
007 US04181966 01/01/1980 Adaptable programmed calculator including a
percent keyboard operator
019 US04181965 01/01/1980 Programmable calculator including program trace
means
??? US04180854 12/25/1979 Programmable calculator having string variable
editing capability
018 US04178633 12/11/1979 Programmable calculator including multifunction
keys
012 US04177520 12/04/1979 Calculator apparatus having a single-step key for
displaying and executing program steps and displaying the result
019 US04177518 12/04/1979 Programmable calculator including scrolling
alphanumeric display means
018 US04164039 08/07/1979 Programmable calculator including a key for
performing either a subtraction or a unary minus function
019 US04164019 08/07/1979 Programmable calculator including alphanumeric
display means
019 US04162532 07/24/1979 Programmable calculator including data format
display control means
019 US04161031 07/10/1979 Programmable calculator including boolean flag
variable means
019 US04159525 06/26/1979 Programmable calculator employing computed memory
addresses
149 US04158285 06/19/1979 Interactive wristwatch calculator
018 US04158233 06/12/1979 Programmable calculator including means for
performing implied multiply operations
019 US04158231 06/12/1979 Programmable calculator including program listing
means
019 US04158228 06/12/1979 Programmable calculator including alphanumeric
error display means
006 US04156921 05/29/1979 Adaptable programmed calculator including
automatic decimal point positioning
018 US04156918 05/29/1979 Programmable calculator including means for
performing computed jumps during program execution
020 US04156917 05/29/1979 Programmable calculator including separate user
program and data memory areas
018 US04156285 05/22/1979 Programmable calculator including keyboard
functions whose argument may be a numeric constant, a storage register, or an
arithmetic expression
018 US04156282 05/22/1979 Programmable calculator including relational
operator means
020 US04152774 05/01/1979 Programmable calculator including keyboard
function means for raising the number ten to any designated power
018 US04152773 05/01/1979 Programmable calculator including means for
establishing a priority for executing algebraic operations
019 US04152771 05/01/1979 Programmable calculator including display means
for signalling the user to indicate the exhaustion of a printer paper supply
020 US04152770 05/01/1979 Programmable calculator including means for
programmably controlling magnetic storage units
019 US04152769 05/01/1979 Programmable calculator including means for
permitting data entry during program execution
022 US04145752 03/20/1979 Programmable calculator including separate line
numbering means for user-definable functions
025 US04145742 03/20/1979 Programmable calculator including user-definable
keys
012 US04127897 11/28/1978 Programmable calculator having extended
input/output capability
012 US04126898 11/21/1978 Programmable calculator including terminal
control means
002 USD0249243 09/05/1978 Wristwatch calculator
002 USD0249090 08/22/1978 Casing for an electronic calculator
011 US04109315 08/22/1978 Wristwatch calculator with selectively scanned
keyboard
028 US04099246 07/04/1978 Calculator having merged key codes
015 US04091270 05/23/1978 Electronic calculator with optical input means
375 US04089059 05/09/1978 Programmable calculator employing a read-write
memory having a movable boundary between program and data storage sections
thereof
014 US04078257 03/07/1978 Calculator apparatus with electronically
alterable key symbols
599 US04075679 02/21/1978 Programmable calculator
021 US04063221 12/13/1977 Programmable calculator
005 US04059750 11/22/1977 General purpose calculator having selective data
storage, data conversion and time-keeping capabilities
009 US04055757 10/25/1977 Calculator apparatus with annuity switch for
performing begin-and end-period annuity calculations
002 USD0245810 09/13/1977 Casing for an electronic calculator
005 US04047012 09/06/1977 General purpose calculator having factorial
capability
002 USD0245107 07/19/1977 Electronic calculator
007 US04037092 07/19/1977 Calculator having preprogrammed user-definable
functions
009 US04035627 07/12/1977 Scientific calculator
002 USD0244862 06/28/1977 Casing for an electronic calculator
013 US04028538 06/07/1977 Programmable calculator employing algebraic
language
589 US04012725 03/15/1977 Programmable calculator
055 US04009379 02/22/1977 Portable programmable calculator displaying
absolute line number addresses and key codes and automatically altering
display formats
092 US04001569 01/04/1977 General purpose calculator having selective data
storage, data conversion and time-keeping capabilities
032 US03996562 12/07/1976 Programmable electronic calculator for evaluating
mathematical problems
009 US03987290 10/19/1976 Calculator apparatus for displaying data in
engineering notation
162 US03971925 07/27/1976 Adaptable programmed calculator having provision
for plug-in keyboard and memory modules
004 US03955074 05/04/1976 General purpose calculator having keys with more
than one function assigned thereto
005 US03946218 03/23/1976 General purpose calculator with capability for
performing yield-to-maturity of a bond calculation
007 US03893173 07/01/1975 Miniaturized magnetic card reader/recorder for
use in hand-held calculator
073 US03863060 01/28/1975 GENERAL PURPOSE CALCULATOR WITH CAPABILITY FOR
PERFORMING INTERDISCIPLINARY BUSINESS CALCULATIONS
007 US03855461 12/17/1974 CALCULATOR WITH KEY CODE ASSOCIATION AND DISPLAY
FEATURES
389 US03839630 10/01/1974 PROGRAMMABLE CALCULATOR EMPLOYING ALGEBRAIC
LANGUAGE
058 US03825736 07/23/1974 CALCULATOR WITH PROVISION FOR EFFICIENTLY
MANIPULATING FACTORS AND TERMS
??? US03781820 12/25/1973 PORTABLE ELECTRONIC CALCULATOR
??? US03769621 10/30/1973 CALCULATOR WITH PROVISION FOR AUTOMATICALLY
INTERPOSING MEMORY ACCESS CYCLES BETWEEN OTHERWISE REGULARLY
??? US03711690 01/16/1973 CALCULATOR AND TESTER FOR USE THEREWITH
??? US03678466 07/18/1972 ELECTRONIC CALCULATOR
??? US03675213 07/04/1972 STORED DATA RECALL MEANS FOR AN ELECTRONIC
CALCULATOR
??? US03668461 06/06/1972 OUTPUT DISPLAY FOR USE WITH A CALCULATOR
??? US03641328 02/08/1972 KEYBOARD ENTRY MEANS AND POWER CONTROL MEANS FOR
CALCULATOR
??? US03623156 11/23/1971 CALCULATOR EMPLOYING MULTIPLE REGISTERS AND
FEEDBACK PATHS FOR FLEXIBLE SUBROUTINE CONTROL
??? US03576983 05/04/1971 DIGITAL CALCULATOR SYSTEM FOR COMPUTING SQUARE
ROOTS
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