SCPE_UNATT 6409 src/simh/scp.c return SCPE_UNATT; SCPE_UNATT 7179 src/simh/scp.c return SCPE_UNATT; SCPE_UNATT 7270 src/simh/scp.c return SCPE_UNATT; SCPE_UNATT 241 src/simh/sim_tape.c return SCPE_UNATT;