Breadboard Computer Documentation

Components Needed:

1. 2 74LS173 (4-bit D-type register)
2. 1 7LS245 chip (transceiver)
3. Breadboard
4. Jumper Wires
5. Breadboard
6. Jumper wires
7. LEDs

Steps:

1. Place the 74LS173 ICs on the Breadboard
   • Insert both 74LS173 ICs into the breadboard, with enough space between them for wiring
2. Connect Power and Ground
   • Connect pin 16 (VCC) of both ICs to the +5V power rail
   • Connect pin 8 (GND) of both ICs to the ground rail
3. Connect Clock Input
   • Connect pin 9 (CLK) of both ICs to the clock signal. You can use a jumper wire to connect pin 9 of both ICs together and then to your clock source
4. Connect Data Inputs
   • For the first 74LS173 IC (lower 4 bits):
     • Connect pin 3 (D0) to the lower 4 bits of the data bus.
     • Connect pin 4 (D1) to the next data bus line.
     • Connect pin 7 (D2) to the next data bus line.
     • Connect pin 6 (D3) to the next data bus line.
   • For the second 74LS173 IC (upper 4 bits):
     • Connect pin 3 (D0) to the upper 4 bits of the data bus.
     • Connect pin 4 (D1) to the next data bus line.
     • Connect pin 7 (D2) to the next data bus line.
     • Connect pin 6 (D3) to the next data bus line.
5. Connect Enable Inputs
   • For both ICs, connect pin 1 to the control logic or directly to ground if you want them always enabled. Usually, these are controlled via the control logic
     • Connect pin 2 (Q0) to the corresponding data bus line
     • Connect pin 5 (Q1) to the corresponding data bus line
     • Connect pin 14 (Q2) to the corresponding data bus line
     • Connect pin 15 (Q3) to the corresponding data bus line
   • For the second 74LS173 IC (upper 4 bits):
     • Connect pin 2 (Q0) to the corresponding data bus line
     • Connect pin 5 (Q1) to the corresponding data bus line
     • Connect pin 14 (Q2) to the corresponding data bus line
     • Connect pin 15 (Q3) to the corresponding data bus line
6. Connect Outputs to Data Bus