Posted by 7 , May 01,1999,16:05 Post Reply  Forum

Suppose I am doing an Addi 127 instruction. First the Addi part is loaded into IR, then 127 is loaded into MRB, but the PC increments and the next instruction (Sto 1) is loaded into MBR. The ALU puts 127 in ACC, but then it replaces 127 with the number for the instruction Sto 1. After all this IR loads the next instruction (CLR) and so it skipped the sto 1 instruction.

What could possibly be causing this problem?