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This is part of the effort to add simulated IMP interfaces in SIMH.

SeeBBN Report 1822for the protocol used to communicate with the IMP.

First reset the IMP:

• t_stat imp_reset (IMP *imp)

Then set imp.receive_bit to a callback which is used to receive datafrom the network. The callback will receive a boolean bit, andanother boolean to say whether the bit was the last in a message. Thecallback has this type:

• t_stat (*) (int bit, int last)

The IMP accepts data from a host using one of these two APIs:

• t_stat imp_send_bits (IMP *imp, uint64 data, int n, int last)
• t_stat imp_send_packet (IMP *imp, void *octets, int n)

The first function accepts input in the lower n bits of data. Messagebits accumulate until last is true.

The second function can be used to send a complete packet with n bits.