If you like that, you should read Bob Pape's free book about the making of R-Type on the Spectrum. I think it was one of the most technically accomplished games on the Spectrum, which is no small feat - there were lots of other talented programmers trying their hardest to achieve the impossible on that platform.

The amazing part of the story is how poorly the industry treated Bob and yet an excellent game still made it to the shops.

http://www.bizzley.com/