Build An 8-Bit Computer Kit Project (Part 4) - Output Register and CPU Control Logic
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Build An 8-Bit Computer Kit Project (Part 4) - Output Register and CPU Control Logic, Build An 8-Bit Computer Kit Project by Ben Eater - Output Register and CPU Control Logic (Kit 4 of 4) This kit is another two-part build, and the first part is the output register. The output register is similar to any other register (like the A and B registers) except rather than display its contents in binary on 8 LEDs, it displays its contents in decimal form on a 7-segment display. Doing that requires some complex logic, but luckily there's an easier way if you check out the output register videos below. Before building the control logic, we want to connect all the modules to a shared bus and test things. The modularity of the design makes it easier to test each module by itself, so we wont ever get to a point where we put it all together and nothing works. Videos are below. CPU Control Logic build: The control logic is the heart of the CPU. It is what defines the opcodes the processor recognizes and what happens when it executes each instruction. There are many videos for the CPU control logic build below. Kit Includes:Part No.Qty.Description 1499481Switch Push Button Tactile SPST OFF-(ON) 15 VDC @ 20mA Actuator Height 0.13 Inch 1511165Capacitor Ceramic Disc 0.1AmicroF 25V A 20% 152295Ceramic Disc Capacitor 0.01AmicroF 50V A 20% Z5U 22995114Red Single-Digit 7-Segment LED Display 0.5"H 223407120LED Blue Diffused 5mm T-1 3/4 470nm 350mcd 225883113-Pin SPDT Slide Switch 22837676830 Point Solderless Plug-in Breadboard with 4 Power Rails 21-26AWG ABS 274221IC LM555P Single Timer (LM555CN,NE555N,TL555P,MC1455P) 33397320LED Red Diffused 5mm (T-1 3/4) 643nm 75mcd 36VA 462521IC 74LS00 Quad 2-Input Positive NAND Gate DIP-14 462871IC 74LS02 QUAD 2-INPUT POSITIVE NOR GATE 463162IC 74LS04 Hex Inverter 463752IC 74LS08 Quad 2-Input Positive AND Gate 464121IC 74LS107 Dual J-K Flip-Flop 466071IC 74LS138 3-to-8 Line Decoder/Demultiplexer 466231IC 74LS139 Dual 2-to-4 Decoder/Demultiplexer 468181IC 74LS161 4-BIT Synchronous Binary Counter 469221IC 74LS173 4-BIT D-Type Register 3-State Output 473861IC 74LS273 Octal D-Type Flip-Flop 69070040Carbon Film Resistor 220 Ohm 1/4 Watt 5% 6908655Resistor Carbon Film 1k Ohm 1/4 Watt 5% 69110410Resistor Carbon Film 10k Ohm 1/4 Watt 5% 6913405Resistor Carbon Film 100k Ohm 1/4 Watt 5% 69390110LED Green Diffused 5mm (T-1 3/4) 565nm 12.5mcd 60VA 746913IC 28C16A-25 EEPROM 16K-Bit 250ns CMOS Parallel 9111892IC 74HC595N 8-Bit Serial-in Serial or Parallel-Out Shift Register without Latches (Tri-State) DIP-16 22838551Keyestudio Nano CH340 Development Board Resources & Downloads 555 timer datasheet (.pdf) 74LS08 Quad AND gate datasheet (.pdf) 74LS107 Dual J/K flip-flop datasheet (.pdf) (substitute for 74LS76; check pinout!) 74LS139 Dual 2-to-4 line decoder/demultiplexer datasheet (.pdf) 74LS273 8-bit D register datasheet (.pdf) 28C16 16K EEPROM datasheet (.pdf) 74LS00 Quad NAND gate datasheet (.pdf) 74LS04 Hex inverter datasheet (.pdf) 74LS161 4-bit binary counter datasheet (.pdf) 74LS138 3-to-8 line decoder/demultiplexer datasheet (.pdf) About the author, Ben Eater Output Register Videos Designing a 7-Segment Hex Decoder Using an EEPROM to Replace Combinational Logic Build an Arduino EEPROM Programmer Build an 8-bit Decimal Display for Our 8-bit Computer Control Logic Prep Videos 8-bit Computer Build: Connecting the Bus