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robertrico
| Reference | Value | Description |
|---|---|---|
| U1-U4 | 74LS193 | Synchronous 4-bit Up/Down (2 clk) counter |
| U5,U53,U69 | 74LS08 | Quad And2 |
| U6,U20 | 74LS163 | Synchronous 4-bit programmable binary Counter |
| U7,U8,U28-U30,U70,U71 | 74LS138 | Decoder 3 to 8 active low outputs |
| U9,U15,U23 | AT28C64B | |
| U10,U22,U50,U52,U57,U60-U62 | 74LS02 | quad 2-input NOR gate |
| U11-U14,U19,U21,U25,U41-U44,U54,U59,U67,U68,U72,U73 | 74LS245 | Octal BUS Transceivers, 3-State outputs |
| U18,U31-U35,U45-U47,U55,U58 | 74LS373 | 8-bit Latch, 3-state outputs |
| U24 | AT28C256 | |
| U26 | MCM60256AP | |
| U27 | 74LS74 | Dual D Flip-flop, Set & Reset |
| U36,U51 | 7400 | quad 2-input NAND gate |
| U37 | 74LS04 | Hex Inverter |
| U38,U40 | 74F382N | |
| U39 | 74LS00 | quad 2-input NAND gate |
| U48 | 74LS157 | Quad 2 to 1 line Multiplexer |
| U49 | 74LS273 | 8-bit D Flip-Flop, reset |
| U56 | 74HC14 | Hex inverter schmitt trigger |
| U63-U66 | 74LS169 | Synchronous 4-bit Up/Down binary counter |
| C1 | 10µF | Polarized capacitor |
| C3-C6,C8-C78 | 0.1µF | Unpolarized capacitor, small symbol |
| D1-D8 | LED | Light emitting diode |
| R1,R17-R24 | 10kΩ | Resistor |
| R2 | 100Ω | Resistor, small symbol |
| R9-R16 | 330Ω | Resistor |
| SW1 | SW_DIP_x08 | 8x DIP Switch, Single Pole Single Throw (SPST) switch, small symbol |
| SW2 | RESET_BTN | Push button switch, generic, two pins |
| SWITCH-GATE1,U16,U17 | 74LS244N | Octal Buffer and Line Driver With 3-State Output, active-low enables, non-inverting outputs |
| Y1 | 4MHz | Crystal Clock Oscillator, DIP14-style metal package |