Hardware

http://zxdn.narod.ru/hardware.htm

http://piters.tripod.com/zx.htm

https://worldofspectrum.org/faq/reference/pinouts.htm

https://worldofspectrum.org/faq/reference/diskreference.htm

https://worldofspectrum.org/faq/reference/ports.htm

Kempston Mouse

EPROM

https://velesoft.speccy.cz/

https://velesoft.speccy.cz/zx-cz.htm

https://tomdalby.com/retro.html

https://www.ac1-info.de/galerie/poppe_heiko/poppe.htm

DivMMC, DivIDE, esxDOS, ResiDOS

• https://velesoft.speccy.cz/other/DIVMMC-compatible-ports.txt
• https://hype.retroscene.org/blog/965.html
• https://esxdos.samcoupe.cz/
• https://zx-pk.ru/archive/index.php/t-8826.html
• https://divide.speccy.cz/
• https://github.com/gasman/goldfinch/tree/master/libsrc/divide
• https://worldofspectrum.org/zxplus3e/software.html
  

RS232

• https://vym.cz/sercp/
• https://cygnus.speccy.cz/popis_zx-spectrum_dg192k_rs232.php
• https://zxnet.co.uk/spectrum/btconnectors/