00454nam a2200157Ia 4500008004100000020001300041082001200054100002200066245004400088250000700132260004300139300002400182500001900206600002100225650005000246240925s9999    xx            000 0 und d  a66690021  a004 DER  aDerfler ,Frank J. 0aInfowords Essential Guide to the IBM PC  aNA  aNew York:bHoughton-Mifflin-coc,1984.  a669p.bNAfOriginal  aIncludes Index  aComputer Science  aComputer science, information & general works