| Produttore elettronici | Il numero della parte | Scheda tecnica | Spiegazioni elettronici |
 National Semiconductor ... | MM74HC942 |  146Kb/8P | MM74HC942 is a full duplex low speed modem |
| MM74HC942J |  146Kb/8P | MM74HC942 is a full duplex low speed modem |
| MM74HC942N |  146Kb/8P | MM74HC942 is a full duplex low speed modem |
 National Semiconductor ... | MM74HC942J |  146Kb/ 8P | MM74HC942 is a full duplex low speed modem |
| MM74HC942N |  146Kb/ 8P | MM74HC942 is a full duplex low speed modem |
| MM74HC943 |  153Kb/ 8P | 300 Baud Modem |
| MM74HC943J |  153Kb/ 8P | 300 Baud Modem |
| MM74HC943N |  153Kb/ 8P | 300 Baud Modem |