SCPE_UNATT 6539 src/simh/scp.c return SCPE_UNATT; SCPE_UNATT 7309 src/simh/scp.c return SCPE_UNATT; SCPE_UNATT 7400 src/simh/scp.c return SCPE_UNATT; SCPE_UNATT 245 src/simh/sim_tape.c return SCPE_UNATT;