USING LSI PROCESSOR BIT-SLICES TO BUILD A PDP-11 453

requests (i.e., Direct Memory Access request via the Unibus), it was not practical to drive the Unibus directly from fields in the microinstruction. Instead, a bus control and timing section was added to the processor. The rest of the processor interfaces to this control unit via the UC<7:0> field in the microinstruction. See Table 1 for a description of the functions of the subfields within UC<7:0>.

Console Functions

In place of a standard front panel, the CMU-11 has front panel functions accessible from a