In Metcalfe and Boggs (1976) https://dl.acm.org/doi/10.1145/360248.360253 https://dl.acm.org/doi/10.1145/360248.360253 they say the max frame size of 3 Mbit/s P

In Metcalfe and Boggs (1976) https://dl.acm.org/doi/10.1145/360248.360253 https://dl.acm.org/doi/10.1145/360248.360253 they say the max frame size of 3 Mbit/s PARC Ethernet was about 4000 bits, big enough for one Xerox Alto disk sector. The 1500 byte frame size was introduced with 10 Mbit/s DIX Ethernet. PARC Ethernet had 8 bit terminal addresses whereas DIX Ethernet introduced 48 bit MAC addresses.