DM74LS28
Quad 2-Input NOR Buffer (Fairchild Semiconductor)
DM74LS283
4-Bit Binary Adder (Fairchild Semiconductor)
DM74LS20
Dual 4-Input NAND Gates (National Semiconductor)
DM74LS20
Dual 4-Input NAND Gate (Fairchild Semiconductor)
DM74LS21
Dual 4-Input AND Gates (National Semiconductor)
DM74LS22
Dual 4-Input NAND Gates (National Semiconductor)
DM74LS221
Dual Non-Retriggerable One-Shot (National Semiconductor)
DM74LS221
Dual Non-Retriggerable One-Shot (Fairchild Semiconductor)
DM74LS240
Octal TRI-STATE Buffers/Line Drivers/Line Receivers (National Semiconductor)
DM74LS240
Octal 3-STATE Buffer/Line Driver/Line Receiver (Fairchild Semiconductor)