| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | MM74C901 |  136Kb/6P | Hex Inverting TTL, Non-Inverting TTL, Inverting CMOS, Non-Inverting CMOS Buffer |
 National Semiconductor ... | MM74C902 |  136Kb/ 6P | Hex Inverting TTL, Non-Inverting TTL, Inverting CMOS, Non-Inverting CMOS Buffer |
 National Semiconductor ... | MM74C903 |  136Kb/ 6P | Hex Inverting TTL, Non-Inverting TTL, Inverting CMOS, Non-Inverting CMOS Buffer |
| MM74C904 |  136Kb/ 6P | Hex Inverting TTL, Non-Inverting TTL, Inverting CMOS, Non-Inverting CMOS Buffer |
 National Semiconductor ... | MM74C906 |  106Kb/ 4P | Hex Open Drain N, P-Channel Buffers |
 National Semiconductor ... | MM74C907 |  106Kb/ 4P | Hex Open Drain N, P-Channel Buffers |