Early
Electronic
Calculator
EEC Update History

13 Jun 2015: Monroe 650 added.
03 Jun 2015: Sony SOBAX 2500 internal pictures added.
03 Jun 2015: Canon Canola 120 added.
07 Aug 2014: HP21 schematic updated with corrections.
07 Aug 2014: HP80 added.
07 Aug 2014: Nat Semi "International Computer" added.
07 Mar 2014: Commodore DAC612 schematic converted to PDF form.
07 Mar 2014: Casio 121B schematic converted to PDF form.
07 Mar 2014: Sharp Compet17 schematic converted to PDF form.
06 Mar 2014: Canon 163 schematic converted to PDF form.
06 Mar 2014: Facit 1123 schematic converted to PDF form.
06 Mar 2014: Toshiba BC-1212 schematic converted to PDF form.
04 Mar 2014: Canon 130S from JC added.
26 Oct 2013: Canon 161 schematic converted to PDF form.
26 Jul 2013: Casio AL-1000 schematic converted to PDF form.
26 Jul 2011: Canon 163 schematic added.
28 Dec 2010: txx retired, converted to PHP generation.
08 Dec 2010: Pic added and minor mods to Fixing the Facit article.
08 Dec 2010: Calculator pictures incorporated into calc page, rather than sub-page.
08 Dec 2010: Canon 130 and 161 internal photos added.
08 Dec 2010: This file restored from 19 Feb 2009.
17 Mar 2008: Pictures and photo gallery added.
10 Feb 2007: Internal diagram for HD3112 IC added.
10 Feb 2007: Assorted JMOS ICs from Casio 121-B added.
10 Feb 2007: Casio 121-B added, with simulation.
06 Jan 2006: Site structure reorganised to eliminate html frames.
06 Jan 2006: Casio AL-1000 technical description article added.
06 Jan 2006: Casio AL-1000 simulation added.
06 Jan 2006: Notes about CMU/single-step control of Sharp Compet 17 and Facit 1123 added.
11 Nov 2004: Compet 17 schematic updated.
02 Nov 2004: Unknown Miida model identifed as Miida MC800, keyboard fault notes added.
25 Oct 2004: 'Memory Technology' type added to desktop calculator info.
19 Oct 2004: Sharp Compet 17 schematic added.
24 Feb 2004: Victor 18-1721 added.
15 Sep 2003: Toshiba BC-1212 schematic added.
03 Sep 2003: Portions of Canon 161 schematic added.
23 Jun 2003: Facit 1123 repair.
23 Jun 2003: Mitsubishi M59xx ICs added.
12 Jun 2003: TI2550 schematic added.
12 Jan 2003: Digimatic D8 schematic added, serial numbers relocated on calc pages.
18 Nov 2002: SSEM simulation moved to TIH.
18 Nov 2002: Wang 320K schematic added.
05 Apr 2002: Canon EP151 entry updated, pinout for SN4552 IC added.
31 Mar 2002: Site structure reorganized for use with auto-generated html.
26 Mar 2002: HP9825B added.
14 Mar 2002: Commodore C110 added.
30 Jan 2002: HP9815A added.
May-Jul 2001: Numerous pocket calculators added.
02 May 2001: AGS-14 and associated IC added.
21 Apr 2001: XONEX ELSI III, TI-1025, TI-30 and associated ICs added.
15 Mar 2001: Toshiba BC-0802, Microlith M4/113G and associated ICs added.
26 Feb 2001: Misc. editorial updates, mechanical machines added.
02 Feb 2001: Victor 18-3441 and Casio TH-10 and associated ICs added.
22 Jan 2001: Canon 161 and Canon 130 entries updated.
08 Dec 2000: Canon 161 and Canon EP151 added.
06 Dec 2000: Turing's Long Division and Square Root programs added to SSEM.
02 Dec 2000: Additional notes to Sony 500 Series IC and SOBAX 2500 calculator pages.
23 Nov 2000: Repair history added to Facit/Sony/Toshiba/Canon/Commodore/Monroe/Sharp calculator pages.
21 Nov 2000: SSEM simulation added.
21 Nov 2000: Sharp ELSI 804 and associated ICs added.
10 Sep 2000: Two-tone title bar added to all pages.
10 Sep 2000: Sharp Compet 17 simulation installed.
27 Aug 2000: Minor improvements for Windows-based systems.
Simulations modified.
25 Aug 2000: "Fixing the Facit" article added.
Simulations modified.
20 Aug 2000: Tables of display devices added.
Mods to Canon 130 display explanation.
04 Aug 2000: Initial Release.



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