Editing ZX Spectrum (section)

=== ZX Spectrum +2A, +2B and +3B ===
[[file:Spectrum 128-2 (retouched).jpg|thumb|ZX Spectrum +2A]]

The ZX Spectrum +2A was a new version of the Spectrum +2<ref name='crashfeb89'>{{cite magazine|title=Dishy New Spectrum in Sex Scandal|magazine=Crash|issue=26|publisher=Newsfield|date=26 January 1989|page=9|url=https://spectrumcomputing.co.uk/page.php?issue_id=1028&page=7|access-date=26 November 2022}}{{Dead link|date=February 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> using the same circuit board as the Spectrum +3.<ref name='crashfeb89' /><ref name='nce101288'>{{cite magazine|title=Amstrad again|magazine=New Computer Express|issue=5|publisher=Future Publishing|date=10 December 1988|page=55|url=https://spectrumcomputing.co.uk/page.php?issue_id=4777&page=55|access-date=26 November 2022|archive-date=8 August 2020|archive-url=https://web.archive.org/web/20200808064929/https://spectrumcomputing.co.uk/page.php?issue_id=4777&page=55|url-status=dead}}</ref> It was sold from late 1988 and unlike the original grey +2 was housed inside a black case.<ref name='crashfeb89' /><ref name='nce101288' /> The Spectrum +2A/+3 motherboard (AMSTRAD part number Z70830) was designed so that it could be assembled with a +2 style "datacorder" connected instead of the [[floppy disk controller]].<ref name="+3-Manual-18">''Spectrum +3 Service Manual''. AMSTRAD. p.18.</ref> The power supply of the ZX Spectrum +2A used the same [[pinout]] as the +3 and has "Sinclair +2" written on the case.<ref name="Fuente+2A">{{cite web|url=http://hardware.speccy.org/hardware/Fuente+2A/imagenes/vista_superior.jpg|title=Image of Spectrum +2A power supply|access-date=21 December 2012|url-status=live|archive-url=https://web.archive.org/web/20130430080452/http://hardware.speccy.org/hardware/Fuente+2A/imagenes/vista_superior.jpg|archive-date=30 April 2013}}</ref>

1989 saw the release of the ZX Spectrum +2B and ZX Spectrum +3B. They are functionally similar in design to the Spectrum +2A and +3,<ref>''Spectrum +2B/+3B Service Manual''. AMSTRAD.</ref> though changes to the generation of the audio output signal were made to resolve problems with [[Clipping (audio)|clipping]].<ref name='nce090989'>{{cite magazine|title=Spex – Sounding Out|magazine=New Computer Express|issue=44|publisher=Future Publishing|date=9 September 1989|page=54|url=https://spectrumcomputing.co.uk/page.php?issue_id=4816&page=54|access-date=26 November 2022}}{{Dead link|date=February 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> The +2B board has no provision for floppy disk controller circuitry, while the +3B motherboard has no provision for connecting an internal tape drive. Production of all Amstrad Spectrum models ended in 1992.<ref name="bbclegacy" />