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 layers63.5 × 45.7 mm
Program counter
codemonkey76/DIY-8-Bit-ComputerDIY 8-Bit Computer, based on the design by Ben Eater
- Size
- 63.5 × 45.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 29
- Nets
- 28
- Pads
- 80
- Tracks, vias
- 237, 5
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 25 Aug 2019
- Updated
- 25 Aug 2019
Overview
Program counter 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 63.5 × 45.7 mm with 29 parts on 28 nets, routed with 237 tracks and 5 vias.
It is built around the 74LS245SC and 74LS161DC. Its parts include 4 resistors, 4 diodes, 3 connectors, 2 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, Transceivers
74LS161DC
-0℃~+70℃ 14ns 32MHz 4 4.75V~5.25V 74LS 93mW Asynchronous Binary Counter Programmable divide ratio、Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous - Counters, DividersTexas InstrumentsCounters, Dividers
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
29| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 220R | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2, R3, R4 |
| 1 | +5V | TestPoint:TestPoint_Pad_1.5x1.5mm | TP11 |
| 1 | 1 | LED_THT:LED_D5.0mm | D4 |
| 1 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | 2 | LED_THT:LED_D5.0mm | D3 |
| 1 | 4 | LED_THT:LED_D5.0mm | D2 |
| 1 | 74LS161 | Package_DIP:DIP-16_W7.62mm_Socket | U2 |
| 1 | 74LS245 | Package_DIP:DIP-20_W7.62mm_Socket | U1 |
| 1 | 8 | LED_THT:LED_D5.0mm | D1 |
| 1 | BUS_0 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP7 |
| 1 | BUS_1 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP8 |
| 1 | BUS_2 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP6 |
| 1 | BUS_3 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP9 |
| 1 | Bus | Connector_JST:JST_PH_S4B-PH-K_1x04_P2.00mm_Horizontal | J2 |
| 1 | CE | TestPoint:TestPoint_Pad_1.5x1.5mm | TP5 |
| 1 | CLK | TestPoint:TestPoint_Pad_1.5x1.5mm | TP3 |
| 1 | GND | TestPoint:TestPoint_Pad_1.5x1.5mm | TP10 |
| 1 | Misc | Connector_JST:JST_PH_S5B-PH-K_1x05_P2.00mm_Horizontal | J1 |
| 1 | Power | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J3 |
| 1 | ~CLR~ | TestPoint:TestPoint_Pad_1.5x1.5mm | TP2 |
| 1 | ~CO~ | TestPoint:TestPoint_Pad_1.5x1.5mm | TP1 |
| 1 | ~J~ | TestPoint:TestPoint_Pad_1.5x1.5mm | TP4 |
The 25 most common of 29 parts.
Questions
How big is the Program counter PCB?
It measures 63.5 × 45.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Program counter use?
29 parts, built around the 74LS245SC and 74LS161DC. 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 Program counter KiCad files?
From the codemonkey76/DIY-8-Bit-Computer repository on GitHub, at the commit this page was made from: the board is Program Counter/program-counter.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Program counter 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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