> > What do you want to do with Spectrum programs that test keyboard > > with 0 in high byte? > > Hi byte is 0 mostly for a PRESS 'ANY KEY' test. > I would map row SPACE SS M N B as the first row to scan. > So one of these keys can be pressed in a ANY KEY situation.
And I forgot Another option is to add another latch to deal with the hi 0 read. But two exta IC's are required. Edwin Blink.
