>> BTW, speaking of the keyboard scan schema of the early "TED" series, >> IMHO it's interesting that both the Sinclair ZX80 and ZX81, and AFAIR >> even the Spectrum did make it into production with this "address lines >> directly used in the keyboard scan process" method |-) > > Yes, but they used the address lines in the ZX, not, as in > the early 264 models, the data lines. This way the row > scanned was determined by the address you used to poll the > single ULA register of the spectrum. Not a bad idea, but it > meant that you had the keyboard matrix hooked up to the > address lines. I doubt you would be able to pass FCC > certification nowadays with a design like this. The ZX Spectrum versus modern legislation: http://focusritedevelopmentteam.wordpress.com/2012/12/11/the-zx-spectrum-versus-modern-legislation/ Message was sent through the cbm-hackers mailing listReceived on 2013-09-09 03:01:24
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