Details here: https://archive.org/details/73-magazine-1988-04/page/n43/mode/2up https://archive.org/details/73-magazine-1988-04/page/n43/mod... 73 Magazine, Ap

Details here: https://archive.org/details/73-magazine-1988-04/page/n43/mode/2up https://archive.org/details/73-magazine-1988-04/page/n43/mod... 73 Magazine, April 1988, page 43. Article says the switches are essentially ASCII, but with the bits shuffled so that lower alpha mainly falls under his strongest fingers. I'll let you read it for further details.