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halfburnttoast
Version 1.1 of my 8-bit, TTL computer.
| Reference | Value | Description |
|---|---|---|
| IC1-IC3 | AT28C64B-15PU | AT28C64B-15PU, Parallel EEPROM Memory 64kbit, Parallel, 150ns 4.5 5.5 V, 28-Pin PDIP |
| U1 | 74HCT02 | quad 2-input NOR gate |
| U2 | 74HC132 | Quad 2-input NAND Schmitt trigger |
| U3,U7 | 74HC02 | quad 2-input NOR gate |
| U4 | MCP100-475D | Microcontroller reset monitor, 4.75V threshold, active low output |
| U5 | 74HCT14 | Hex inverter schmitt trigger |
| U6 |
| 8-bit serial-in parallel-out shift register |
| U8,U10,U11,U24 | 74HC273 | 8-bit D Flip-Flop, reset |
|---|
| U9 | 74HC4040 | Binary Counter 12 stages (Asynchronous) |
|---|
| U12-U14 | 74HC138 | Decoder 3 to 8 active low outputs |
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| U15,U16 | 74HC86 | Quad 2-input XOR |
|---|
| U17,U18 | 74HC00 | quad 2-input NAND gate |
|---|
| U19,U20 | 74HC157 |
|---|
| U21 | 74HC14 | Hex inverter schmitt trigger |
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| U22,U23 | 74HC283 |
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| U25 | 74HC74 | Dual D Flip-flop, Set & Reset |
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| U26,U28,U29,U38-U41 | 74HC245 |
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| U27,U30 | 74HC688 | 8-bit magnitude comparator |
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| U31 | AS6C4008-55PCN | 512K x 8 Low Power CMOS RAM, DIP-32 |
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| U32,U33 | 74HC670 | 4 x 4 Register Files 3-State Outputs |
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| U34-U37 | 74HC161 |
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| U42,U43 | 74HC574 | 8-bit Register, 3-state outputs |
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| C1,C2 | 34p | Unpolarized capacitor |
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| C3 | 330u | Polarized capacitor |
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| C4 | 47u | Polarized capacitor |
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| C5-C47 | 100n | Unpolarized capacitor |
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| C48,C49 | 100u | Polarized capacitor |
|---|
| D1 | D_TVS | Bidirectional transient-voltage-suppression diode |
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| D2 | LED | Light emitting diode |
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| J1,J4 | Conn_02x20_Counter_Clockwise | Generic connector, double row, 02x20, counter clockwise pin numbering scheme (similar to DIP package numbering), script generated (kicad-library-utils/schlib/autogen/connector/) |
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| J2 | Conn_01x02 | Generic connector, single row, 01x02, script generated (kicad-library-utils/schlib/autogen/connector/) |
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| J3,J5,J6 | Conn_01x03_Pin | Generic connector, single row, 01x03, script generated |
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| J7 | USB_B | USB Type B connector |
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| R1 | 330 | Resistor |
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| R2 | 1M | Resistor |
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| R3 | Rs | Resistor |
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| R4 | 10K | Resistor |
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| R8 | 1K | Resistor |
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| SW1 | RESET | Push button switch, generic, two pins |
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| TP1,TP2,TP4-TP6 | TestPoint | test point |
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| Y1 | 12MHz - 18p | Two pin crystal |
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