Interesting things on computers, Spectrum, Commodore, ROM chips, Kernal

https://en.m.wikipedia.org/wiki/KERNAL


Also
Transformer Read Only Memory
http://www.freepatentsonline.com/3432830.pdf


See also Wikipedia
ROM
https://en.m.wikipedia.org/wiki/Read-only_memory


The ZX spectrum
Still looks so modern
https://en.m.wikipedia.org/wiki/ZX_Spectrum


Interesting how the servicing manual of the ZX Spectrum is given in reference 25 of Wikipedia article by THORN EMI DATATECH LTD
https://k1.spdns.de/Vintage/Sinclair/82/Sinclair%20ZX%20Spectrum/Repair/ZX%20Spectrum%20Service%20Manual%20(OCRed).pdf


Information on spectrum
https://spectrumforeveryone.com/technical/