Arpanet Imp Implemented in C

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GitHub - larsbrinkhoff/imp: New implementation of an Arpanet IMP · GitHub

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Arpanet IMP implemented in C

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

See BBN Report 1822<br>for the protocol used to communicate with the IMP.

API

First reset the IMP:

t_stat imp_reset (IMP *imp)

Then set imp.receive_bit to a callback which is used to receive data<br>from the network. The callback will receive a boolean bit, and<br>another boolean to say whether the bit was the last in a message. The<br>callback 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. Message<br>bits accumulate until last is true.

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

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New implementation of an Arpanet IMP

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emulator

retrocomputing

computer-history

imp

ncp

arpanet

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