74LS28
QUAD 2-INPUT NOR BUFFER (Motorola)
74LS280
LOW POWER SCHOTTKY (ON Semiconductor)
74LS280
9-bit Odd/Even Parity Generators/Checkers (Hitachi Semiconductor)
74LS283
4-Bit Binary Adders (National Semiconductor)
74LS284
4-bit parallel binary multiplier (San Mao)
74LS289
64BIT RANDOM ACCESS MEMORY (ETC)
74LS20
Dual 4-Input NAND Gate (Fairchild Semiconductor)
74LS20
Dual 4-input Positive NAND Gates (Hitachi Semiconductor)
74LS20
Dual 4-Input NAND Gates (National Semiconductor)
74LS20
DUAL 4-INPUT NAND GATE (Motorola)