> I'm not quite sure how you mean.... the CD74HCT22106E is an 8x8 > crosspoint switch - i.e. 64 analogue switches (like the 4 in the > 4066) each with its own flip flop to keep it in the open or > closed state. Each of these 64 switches corresponds to a key > on the SAM keyboard -- but, since the SAM's keyboard is actually > an 8x9 matrix, I had to extend the crosspoint switch by one > row (actually only 5/8ths of a row), hence the ls273 and the > two 4066s.
Whoops !! (Again) I thought it was a 256 switch array. (should have read the the datasheet) > I'm open to suggestions! How about replacing the array with a SRAM in that case you don't need those 2 IC's (might be cheaper also) ? Edwin Blink [EMAIL PROTECTED] http://home.wanadoo.nl/blink/samcoupe/index.htm
