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
Instruction register
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
- 46
- Nets
- 30
- Pads
- 126
- Tracks, vias
- 522, 48
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 25 Aug 2019
- Updated
- 25 Aug 2019
Overview
Instruction register 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 46 parts on 30 nets, routed with 522 tracks and 48 vias.
It is built around the 74LS245SC and 74LS173SC. 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
274LS245SC
-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
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
46| 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 | TP17 |
| 1 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | 74LS245 | Package_DIP:DIP-20_W7.62mm_Socket | U1 |
| 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 | TP15 |
| 1 | CLR | TestPoint:TestPoint_Pad_1.5x1.5mm | TP14 |
| 1 | GND | TestPoint:TestPoint_Pad_1.5x1.5mm | TP18 |
| 1 | IR_4 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP9 |
| 1 | IR_5 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP10 |
| 1 | IR_6 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP11 |
| 1 | IR_7 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP12 |
| 1 | Instruction | Connector_JST:JST_PH_S4B-PH-K_1x04_P2.00mm_Horizontal | J2 |
| 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 | ~II~ | TestPoint:TestPoint_Pad_1.5x1.5mm | TP16 |
| 1 | ~IO~ | TestPoint:TestPoint_Pad_1.5x1.5mm | TP13 |
The 42 most common of 46 parts.
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Questions
How big is the Instruction register PCB?
It measures 78.7 × 58.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Instruction register use?
46 parts, built around the 74LS245SC and 74LS173SC. 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 Instruction register KiCad files?
From the codemonkey76/DIY-8-Bit-Computer repository on GitHub, at the commit this page was made from: the board is Instruction Register/instruction-register.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Instruction register design in my own project?
Its repository states no licence, so its author keeps all rights: ask codemonkey76 before reusing the design.