<P> It is considered illegal to use the ARPANet for anything which is not in direct support of Government business...personal messages to other ARPANet subscribers (for example, to arrange a get - together or check and say a friendly hello) are generally not considered harmful...Sending electronic mail over the ARPANet for commercial profit or political purposes is both anti-social and illegal . By sending such messages, you can offend many people, and it is possible to get MIT in serious trouble with the Government agencies which manage the ARPANet . </P> <P> Support for inter-IMP circuits of up to 230.4 kbit / s was added in 1970, although considerations of cost and IMP processing power meant this capability was not actively used . </P> <P> 1971 saw the start of the use of the non-ruggedized (and therefore significantly lighter) Honeywell 316 as an IMP . It could also be configured as a Terminal Interface Processor (TIP), which provided terminal server support for up to 63 ASCII serial terminals through a multi-line controller in place of one of the hosts . The 316 featured a greater degree of integration than the 516, which made it less expensive and easier to maintain . The 316 was configured with 40 kB of core memory for a TIP . The size of core memory was later increased, to 32 kB for the IMPs, and 56 kB for TIPs, in 1973 . </P> <P> In 1975, BBN introduced IMP software running on the Pluribus multi-processor . These appeared in a few sites . In 1981, BBN introduced IMP software running on its own C / 30 processor product . </P>

Arpanet was what is considered to be the beginning of the internet