ibm440spe_decode_bas
banktop = ibm440spe_decode_bas(mfdcr(DCRN_MQ0_B0BAS));
banktop = ibm440spe_decode_bas(mfdcr(DCRN_MQ0_B1BAS));
banktop = ibm440spe_decode_bas(mfdcr(DCRN_MQ0_B2BAS));
banktop = ibm440spe_decode_bas(mfdcr(DCRN_MQ0_B3BAS));