mgp_port_num      892 src/dps8/dps8_cable.c         uint mgp_port_num = 0;
mgp_port_num      895 src/dps8/dps8_cable.c                            unit_idx, mgp_port_num,
mgp_port_num      898 src/dps8/dps8_cable.c                            & cables->mgp_to_iom[unit_idx][mgp_port_num],