Mano State Machine

• Mano Tutorial Introduction
• Mano State Machine
• Mano Examples
• Mano Utilities
• My Computer Simulator
• CMIS 310
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Links on this page:

• Hardware Elements
• Flow Chart
• Data Paths

Dr. M. Moris Mano describes a basic computer in his textbook,
Computer System Architecture, 3rd edition, 1993.

This computer is a toy computer, but serves to present many of the basic concepts
behind all digital computers and
gives us a good platform to study some key features of assembly language programming.

The sample programs I have included in this tutorial
can be assembled and executed using My Computer Simulator.

• AR – 12 bits, address
• controls: clear, count, load
• PC – 12 bits, program counter
• controls: clear, count, load
• AC – 16 bits, accumulator
• controls: clear, count, load
• DR – 16 bits, data register
• controls: clear, count, load
• IR – 16 bits, instruction register
• control: load only
• TR – 16 bits, temporary
• controls: clear, count, load
• OUTR – 8 bits, output
• control: load only
• INPR – 8 bits, input
• no control lines
• SC – 4 bits, sequence counter
• controls: clear, count

• 4096 words x 16bits/word
• controls: read, writex

• I – indirect addressing mode
• S – start/stop
• E – ALU carry out
• R – interrupt event
• IEN – interrupt enabled
• FGI – input available
• FGO – output processed

• 3x8 operation (op) code
• 4x16 sequencer (timing)

• 16 bits
• 3 bit selector

• AC ← AC ∧ DR
• AC ← AC + DR
• AC ← DR
• AC ← INPR (bits 0-7)
• AC ← AC’
• shift right, AC(15) ← E
• shift left,  AC(0 ) ← E