2 layers90.2 × 99.1 mm
Control logic
codemonkey76/DIY-8-Bit-Computer
DIY 8-Bit Computer, based on the design by Ben Eater
94 parts
2 layers78.7 × 58.4 mm
Register a
codemonkey76/DIY-8-Bit-ComputerDIY 8-Bit Computer, based on the design by Ben Eater
- Size
- 78.7 × 58.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 50
- Nets
- 30
- Pads
- 134
- Tracks, vias
- 538, 51
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 25 Aug 2019
- Updated
- 25 Aug 2019
Overview
Register a is an open-source printed circuit board by codemonkey76, from the codemonkey76/DIY-8-Bit-Computer repository on GitHub. It is a 2-layer board of 78.7 × 58.4 mm with 50 parts on 30 nets, routed with 538 tracks and 51 vias.
It is built around the 74LS245SC, 74LS173SC and A1, with the A2, A3 and A4 among its other parts. Its parts include 8 resistors, 8 diodes, 4 connectors, 3 ICs and 1 capacitor. It belongs with the retro computing and games boards of this library.
Main components
974LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers74LS173SC
CDIP-160℃~+70℃ 10ns 10ns 28mA 30MHz 4 4.75V~5.25V 40ns@5V,15pF 74LS Series Asynchronous D-Type Reset Rising Edge Tri-State CDIP-16 Flip FlopsTexas InstrumentsFlip Flops
A1
SOD-123FLDiodes - General PurposeWild GooseA2
SOD-123FL-55℃~+150℃ 1 Independent 1.1V@1A 100V 1A 30A 50uA SOD-123FL Diodes - General Purpose ROHSZhengxinDiodes - General PurposeA3
SOD-123FL-55℃~+150℃ 1 Independent 1.1V@1A 1A 200V 30A 50uA SOD-123FL Diodes - General Purpose ROHSZhengxinDiodes - General PurposeA4
SOD-123FL-55℃~+150℃ 1 Independent 1.1V@1A 1A 30A 400V 5uA SOD-123FL Diodes - General Purpose ROHSZhengxinDiodes - General PurposeA5
SOD-123FL-65℃~+150℃ 1 Independent 1.1V@1A 25A 600V 800mA SOD-123FL Diodes - General Purpose ROHSDDFDiodes - General Purpose
A6
SOT89-3-20℃~+85℃@(Ta) 1 1.8uA 5V 60V 70dB@(1kHz) 70mV@(10mA) Fixed Over Temperature Protection、Enable、Short Circuit Protection Positive SOT89-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSSeaward ElecVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsA7
SOD-123FL1.1V@1A 1A 1kV 25A 5uA@1kV Independent SOD-123FL Diodes - General Purpose ROHSGOODWORKDiodes - General Purpose
README
README.mdDIY-8-Bit-Computer
Based off schematics and design of breadboard computer by Ben Eater, available in kit form at: https://eater.net/8bit/kits
Parts
50| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 220R | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8 |
| 8 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4, D5, D6, D7, D8 |
| 2 | 74LS173 | Package_DIP:DIP-16_W7.62mm_Socket | U2, U3 |
| 1 | +5V | TestPoint:TestPoint_Pad_1.5x1.5mm | TP21 |
| 1 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | 74LS245 | Package_DIP:DIP-20_W7.62mm_Socket | U1 |
| 1 | A_0 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP16 |
| 1 | A_1 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP15 |
| 1 | A_2 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP14 |
| 1 | A_3 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP13 |
| 1 | A_4 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP12 |
| 1 | A_5 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP11 |
| 1 | A_6 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP10 |
| 1 | A_7 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP9 |
| 1 | Address | Connector_JST:JST_PH_S8B-PH-K_1x08_P2.00mm_Horizontal | J2 |
| 1 | BUS_0 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP8 |
| 1 | BUS_1 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP7 |
| 1 | BUS_2 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP6 |
| 1 | BUS_3 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP5 |
| 1 | BUS_4 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP4 |
| 1 | BUS_5 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP3 |
| 1 | BUS_6 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP2 |
| 1 | BUS_7 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP1 |
| 1 | Bus | Connector_JST:JST_PH_S8B-PH-K_1x08_P2.00mm_Horizontal | J1 |
| 1 | CLK | TestPoint:TestPoint_Pad_1.5x1.5mm | TP18 |
| 1 | CLR | TestPoint:TestPoint_Pad_1.5x1.5mm | TP19 |
| 1 | GND | TestPoint:TestPoint_Pad_1.5x1.5mm | TP22 |
| 1 | Misc | Connector_JST:JST_PH_S4B-PH-K_1x04_P2.00mm_Horizontal | J3 |
| 1 | Power | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J4 |
| 1 | ~AI~ | TestPoint:TestPoint_Pad_1.5x1.5mm | TP17 |
| 1 | ~AO~ | TestPoint:TestPoint_Pad_1.5x1.5mm | TP20 |
The 46 most common of 50 parts.
Questions
How big is the Register a PCB?
It measures 78.7 × 58.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Register a use?
50 parts, built around the 74LS245SC, 74LS173SC, A1 and A2. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Register a KiCad files?
From the codemonkey76/DIY-8-Bit-Computer repository on GitHub, at the commit this page was made from: the board is Register A/register-a.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Register a design in my own project?
Its repository states no licence, so its author keeps all rights: ask codemonkey76 before reusing the design.
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