As described in article before about the architecture of Microcomputer SAP-1 , in this article we will continue with other part of Microcomputer Diagram Block and circuit .
For you reference , in figure 10-1 as described have Instruction Register, Accumulator, B Register, Output Register, and Binary Display, We will describe all about it in this article.
For you reference , in figure 10-1 as described have Instruction Register, Accumulator, B Register, Output Register, and Binary Display, We will describe all about it in this article.
Instruction Register
The Instruction register is part of the control unit. to fetch an instruction from the memory the computer does a memory read operation.
This places the contents of the addressed memory location on the W bus . At the same time, the instruction register is set up for loading on the next positive clock edge.
The contents of the instruction register are split into two nibbles. The upper nibble is a two-state output that goes directly to the block labeled "Controller sequencer". The lowe nibble is a three-state output that is read onto the W bus when needed.
Controller-Sequencer
The lower left block contains the controller-sequencer. Before each computer run, a Low CLR signal is sent to the program counter and a CLR signal to the instruction register.
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