Program counter
About the Program counter PCB
Program counter is an open source PCB design by ifilot, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 101.6 × 27.9 mm, with 26 components from 12 distinct parts.
Other key parts include the 74HC161, 74HC245 and 74HC00. By type, the board carries 11 diodes, 5 resistors, 4 ICs, 4 capacitors and 2 connectors.
From the project
Modular 8-bit computer built with TTL logic units to create a "Simple as Possible" system
This project showcases the design and construction of a modular 8-bit computer built with TTL logic units. The core principle behind the project is to create a "Simple as Possible" system, focusing on simplicity, modularity, and compactness.
- TTL Logic-Based Design: The computer is built using traditional TTL (Transistor-Transistor Logic) components, adhering to a fundamental, hands-on approach to computing. - Modular Architecture: Designed for modularity, each functional unit (ALU, registers, memory, control logic, etc.) is implemented as a separate module, allowing for easy debugging…
Main components on the Program counter
Program counter bill of materials (BOM)
26 components, 12 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 74HC161 | SO-16_3.9x9.9mm_P1.27mm | U1, U2 |
| 1 | 74HC245 | SOIC-20W_7.5x12.8mm_P1.27mm | U3 |
| 1 | 74HC00 | SO-14_3.9x8.65mm_P1.27mm | U4 |
| 1 | BUS | PinHeader_1x10_P2.54mm_Vertical | J1 |
| 1 | SIGNALS | PinHeader_1x10_P2.54mm_Vertical | J2 |
| 8 | LED_Small | LED_0805_2012Metric | D1, D2, D3, D4, D5, D6, D7, D8 |
| 1 | CE | LED_0805_2012Metric | D9 |
| 1 | J | LED_0805_2012Metric | D10 |
| 1 | CO | LED_0805_2012Metric | D11 |
| 4 | C | C_0805_2012Metric | C1, C2, C3, C4 |
| 3 | 330 | R_0805_2012Metric | R1, R2, R3 |
| 2 | 220 | R_Array_Convex_4x0603 | RN1, RN2 |
Program counter design files
The KiCad project lives in the ifilot/sap-smd repository on GitHub; these links point at the commit this page was built from.
Program counter: common questions
How big is the Program counter PCB?
The Program counter measures 101.6 × 27.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Program counter?
26 components, from 12 distinct parts. The full bill of materials is listed on this page.
Where can I download the Program counter design files?
From the ifilot/sap-smd repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Program counter design in my own project?
Yes, under the terms of its CERN-OHL-S-2.0 license, which ifilot chose for the repository.
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