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| 2023 Oct 06: | TO DO: add M58201, M58204, M58206, M58212 to M5800 pinouts diagram. |
| 2023 Oct 06: | TEAL IME-41 added. |
| 2022 Mar 00: | TEAL abc-800 added. |
| 2021 Aug 22: | TEAL Riccar added. |
| 2021 Aug 22: | JMOS substitutes commentary expanded, amalgamated into JMOS page; Japanese clocking page also amalgamated into JMOS page; several JMOS ICs from Riccar added. |
| 2021 Feb 07: | Internal photos added for Commodore US1 & US10, Miida MC840, Monroe 610, Rapidman 1220, Ricomac 1216, Sharp ELSI 804, Victor 19-1421, Victor 204, CDK C1HB. |
| 2021 Feb 01: | Miida MC1214 added. |
| 2020 Oct 26: | Internal photos added for Toshiba BC-1212, Facit 1123, Sharp Compet 17, Monroe 925. Royal Digital 1 schematic & TOO updated. Toshiba BC 1212 digit-driver capacitors failure note moved into calc page rather than being separate page. Some commentary added. |
| 2020 May 17: | Site update, photos of numerous pocket calculators added, including internal photos, numerous schematics added. |
| 2020 May 17: | Sears 728.58821 added. |
| 2020 May 17: | TEAL Royal Digital I added. With schematic & Theory of Operation. M5800 JMOS ICs added. |
| 2020 May 17: | LogicData TA-9 added. |
| 13 Jun 2015: | Monroe 650 added. |
| 03 Jun 2015: | Sony SOBAX 2500 internal photos 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 photos 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: | Photos and galleries 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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Calculators
| Integrated Circuits
| Displays
| Simulations
EEC |
