00299nam a2200109 a 450000500170000008200160001710000210003324500610005426000320011530000210014763000210016820251202164222.0  a001.64bHAL  aHall, Doughlas V  aMicroprocessor and interfasing  programming and hardware  aNew YorkbMcGraw Hillc1986  a554p.c22cm.bPB  aComputer Science