This is not an exhaustive list of all updates but is instead a condensed version showing the last major change to each topic or item on my website. Minor changes, such as paragraph re-wording or code optimisation, are not listed here since they do not invalidate the previous version.

19/09/2017 - Update to the ZX ROM Cartridge Creator utility.
16/09/2017 - Update to the ZX81 Software Archive.
12/09/2017 - Release of the Chroma Program Enhancement Creator utility.
22/07/2017 - Release of Colour Rocket Man for the Chroma interface.
15/07/2017 - Release of commented disassembly of the classic ZX81 game Rocket Man.
15/07/2017 - Release of a conversion of Rocket Man for the 48K Spectrum.
03/06/2017 - Release of Colour Mazogs for the Chroma interface.
03/06/2017 - Bug fix to flicker-free Mazogs for the ZX80.
29/05/2017 - Revision to commented disassembly of the classic ZX81 game Mazogs.
13/05/2017 - Update to the ZX Tape Player utility.
13/05/2017 - Update to the ZX File Converter utility.
13/05/2017 - Update to the ZX Sprite Designer utility.
13/05/2017 - Update to the SPECTRA Image Creator utility.
19/04/2017 - Release of a patch to add ZXpand joystick support to Against The Elements.
25/02/2016 - Update to Against The Elements for the 16K ZX81.
23/01/2017 - New bug description added to the Spectrum 128 ROM 0, Spectrum +2 ROM 0, Spanish 128 ROM 0 and Spectrum +2A/+3 ROM 1 disassemblies.
18/12/2016 - Release of the SPECTRA+128 supplement manual, along with information about the SPECTRA+3 Adapter that allows the SPECTRA+128 interface to be used with the Spectrum+2A/+3.
29/11/2016 - Revision to commented disassembly of the classic ZX81 game 3D Monster Maze.
27/11/2016 - Release of a conversion of 3D Monster Maze for the 48K Spectrum.
23/11/2016 - Release of a conversion of Mazogs for the 48K Spectrum.
17/03/2016 - Added a description of how Celebration for the 16K ZX81 works.
04/01/2016 - Bug fix to Kempston joystick support in ZX80/81 Kong.
04/01/2016 - Bug fix to Kempston joystick support in ZX80/81 Pacman.
30/11/2015 - Release of the ZX File Converter utility.
08/08/2015 - Announcement of the SPECTRA+128 upgrade to allow SPECTRA to work with the Spectrum 128 and +2.
08/08/2015 - New version of the Spectrum ZXC3 Flash Programmer utility supporting 57600 baud transfer speed.
20/10/2014 - Release of the Chroma SCART interface for the ZX81.
27/07/2014 - Release of the ZXC4 ROM cartridge.
27/07/2014 - New version of the Microdrive Emulator ROM cartridge, including the enhanced version for exclusive use with the SPECTRA SCART interface.
27/07/2014 - New version of the Spectrum RS232 ROM cartridge, with specific versions for the ZXC3 and ZXC4.
27/07/2014 - New version of the Spectrum and Interface 1 ROM cartridge, with specific versions for the ZXC3 and ZXC4.
10/06/2014 - New version of the 128 RAM Tester ROM cartridge.
06/03/2014 - Added details of the SPECTRA Game Designer, and Blitz written for SPECTRA using the ZX BASIC Compiler.
31/05/2013 - Release of the fourth edition manual for the SPECTRA SCART interface for the 16K/48K Spectrum.
22/06/2012 - Release of the SPECTRA SCART interface for the 16K/48K Spectrum.
05/01/2012 - New version of the ZX80 Emulator ROM cartridge.
04/09/2011 - Added details about the flicker-free ZX80 game 'Double Breakout' by Beam Software.
04/09/2011 - Added details about the flicker-free ZX80 game 'Super Invasion' by Beam Software.
15/05/2011 - Added details about the 8K BASIC ROM upgrade for the ZX80.
08/05/2011 - Added details about the Volume Tester Utility for the ZX80.
07/05/2011 - Added details about the reconstruction of the flicker-free ZX80 game 'QS Defenda' by Quicksilva.
17/04/2011 - Added details about the reconstruction of the flicker-free ZX80 game '1K Space Invaders' by Macronics.
12/03/2011 - Added details about the flicker-free ZX80 game '1K Breakout' by Macronics.
20/12/2010 - Add the Currah uSource Emulator ROM cartridge.
20/12/2010 - New version of the Spanish 128 Emulator ROM cartridge.
20/12/2010 - New version of the Spectrum 128 Emulator ROM cartridge.
01/12/2010 - Added details of the Jupiter Ace Emulator for the Spectrum +2A/+3.
01/12/2010 - New version of the Jupiter Ace ROM cartridge, now supporting RS232 data transfers at 19200 baud.
07/07/2010 - Added details about improving the ZX80 video signal.
09/05/2010 - New version of the ROM Tester ROM cartridge to detect the Scandanavian Spectrum.
07/05/2010 - Added details about the Spectrum +2 Test Program PCB.
06/05/2010 - Added SE BASIC ROM cartridge (3rd party program).
06/05/2010 - Added Gosh Wonderful BASIC ROM cartridge (3rd party program).
03/05/2010 - Added pages describing the mechanism allowing flicker-free ZX80 programs, including a disassembly of the flicker-free 3K Space Invaders game by Macronics.
07/01/2010 - New version of the Microdrive-Cassette Copier ROM cartridge.
18/11/2009 - Release of the ZXC3 ROM Cartridge.
14/10/2009 - Added Test Program disassemblies.
14/10/2009 - Added System Test ROM cartridge instruction scans.
29/08/2009 - Added Spectrum Test Program.
19/08/2009 - Added Death Star game ROM cartridge (3rd party program).
05/04/2009 - Added details on a method for Extending Spectrum 128 BASIC.
03/04/2009 - Bug fix to Spectrum 128 Emulator ROM cartridge.