Below is a list of all the websites of any relevance that I have found to date. I will add to it whenever I discover new ones, but, if I am missing any that you know of please send them to me using the contact form.
some of these sites are now defunct, therefore I have added the archived link instead. I don’t have a description of each site yet, but I am hoping to get around to it at some stage.
- https://oldcomputer.info/8bit/hx20/index.htm#video
- https://www.old-computers.com/museum/computer.asp?c=143&st=1
- http://www.geocities.ws/abcmcfarren/hx20/hx20.htm
- https://web.archive.org/web/20160905055721/http://www.epson.com:80/cgi-bin/Store/support/supDetail.jsp?BV_UseBVCookie=yes&oid=14492&infoType=Doc
- https://web.archive.org/web/20171201012049/http://classway.com:80/hx20/
- https://fjkraan.home.xs4all.nl/comp/hx20/
- https://frigolit.net/projects/hxemu/
- http://www.wickensonline.co.uk/app/index.html#/hx20
- https://web.archive.org/web/20191006233326/http://electrickery.xs4all.nl/comp/hx20/doc/index.html
- https://www.artscipub.com/history/hx20/
- https://web.archive.org/web/20100410090844/http://home.arcor.de:80/magnos/ccg/introccg.html
- https://web.archive.org/web/20190910040213/http://stephan.paukner.cc/syslog/archives/459-Rescuing-data-from-an-Epson-HX-20-to-a-Linux-PC.html
- https://www.forum64.de/index.php?thread/62874-epson-hx-20-eva-epson-video-adapter-alternativen/
- https://www.batterymart.com/p-p130scr-4hx-laptop-battery.html
- https://www.ebay.com/itm/271385741629#shpCntId
- https://norbertkehrer.github.io/flashx20.html
- https://global.epson.com/company/corporate_history/milestone_products/13_hx20.html
- https://www.mh-aerotools.de/hp/hx-20/
- https://web.archive.org/web/20160404183947/http://tkc8800.com/post/epson-hx-20-revival
- http://bahamas.gestalter.at/hx20/software/
- http://www.ganjatron.net/retrocomputing/epson-hx20/index.html
- https://oldcrap.org/2019/10/27/epson-hx-20/
- http://hx20.jatman.uk/
- https://www.nightfallcrew.com/31/03/2013/epson-hx-20-presentation-and-replacing-old-accumulators-nicd/
- https://www.youtube.com/watch?v=gq3OP2asN5M
- https://web.archive.org/web/20180830020614/http://nostalcomp.cz/epson_hx20_romcart.php
- https://web.archive.org/web/20181203190521/http://nostalcomp.cz/epson_hx20_romcart.php
- http://www.chrismcovell.com/diary.html
- https://stardot.org.uk/forums/viewtopic.php?f=45&t=13893
- http://dunfield.classiccmp.org/epson/index.htm
- https://github.com/nerdprojects/epson-hx20-software/tree/main