1 votes 1 votes how many NAND gates are required for two dimensional addressing of 256 * 8 bit ROM using 8*1 selector ?? papesh asked Oct 4, 2016 papesh 811 views answer comment Share Follow See 1 comment See all 1 1 comment reply mcjoshi commented Oct 4, 2016 reply Follow Share It's GATE1991(ECE) question. Watch this 1 votes 1 votes Please log in or register to add a comment.