Ramrom
About the Ramrom PCB
Ramrom 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 × 55.9 mm, with 48 components from 26 distinct parts.
Other key parts include the CY62256-70PC, SST39SF040, 74HC157, 74HC02 and 74HC245. By type, the board carries 19 diodes, 9 resistors, 7 ICs, 7 capacitors, 4 connectors and 2 switches.
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 Ramrom
Ramrom bill of materials (BOM)
48 components, 26 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CY62256-70PC | DIP-28_W15.24mm_Socket | U1 |
| 1 | SST39SF040 | DIP-32_W15.24mm_Socket | U2 |
| 2 | 74HC157 | SO-16_3.9x9.9mm_P1.27mm | U3, U6 |
| 1 | 74HC02 | SO-14_3.9x8.65mm_P1.27mm | U4 |
| 2 | 74HC245 | SO-20_12.8x7.5mm_P1.27mm | U5, U7 |
| 1 | ADDR LOWER | PinHeader_1x10_P2.54mm_Vertical | J1 |
| 1 | ADDR UPPER | PinHeader_1x10_P2.54mm_Vertical | J2 |
| 1 | BUS | PinHeader_1x10_P2.54mm_Vertical | J3 |
| 1 | SIGNALS | PinHeader_1x10_P2.54mm_Vertical | J4 |
| 1 | SW_DIP_x08 | SW_DIP_SPSTx08_Slide_6.7x21.88mm_W7.62mm_P2.54mm_LowProfile | SW1 |
| 1 | SW_SPDT | SW_Slide_1P2T_CK_OS102011MS2Q | SW2 |
| 2 | D0 | LED_0805_2012Metric | D1, D9 |
| 2 | D1 | LED_0805_2012Metric | D2, D10 |
| 2 | D2 | LED_0805_2012Metric | D3, D11 |
| 2 | D3 | LED_0805_2012Metric | D4, D12 |
| 2 | D4 | LED_0805_2012Metric | D5, D16 |
| 2 | D5 | LED_0805_2012Metric | D6, D17 |
| 2 | D6 | LED_0805_2012Metric | D7, D18 |
| 2 | D7 | LED_0805_2012Metric | D8, D19 |
| 1 | RO | LED_0805_2012Metric | D13 |
Show 6 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | RRO | LED_0805_2012Metric | D14 |
| 1 | RI | LED_0805_2012Metric | D15 |
| 7 | C | C_0805_2012Metric | C1, C2, C3, C4, C5, C6, C7 |
| 3 | 330 | R_0805_2012Metric | R1, R2, R3 |
| 2 | 10k | R_Array_Convex_4x0603 | RN1, RN2 |
| 4 | 220 | R_Array_Convex_4x0603 | RN3, RN4, RN5, RN6 |
Ramrom 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.
Ramrom: common questions
How big is the Ramrom PCB?
The Ramrom measures 101.6 × 55.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Ramrom?
48 components, from 26 distinct parts. The full bill of materials is listed on this page.
Where can I download the Ramrom 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 Ramrom design in my own project?
Yes, under the terms of its CERN-OHL-S-2.0 license, which ifilot chose for the repository.
More boards in sap-smd
Clock
101.6 × 55.9 mm72 parts2LCERN-OHL-S-2.02
Instruction decoder
101.6 × 55.9 mm68 parts2LCERN-OHL-S-2.02
Alu advanced
101.6 × 55.9 mm51 parts2LCERN-OHL-S-2.02
Alu
101.6 × 55.9 mm42 parts2LCERN-OHL-S-2.02
Output register
101.6 × 55.9 mm30 parts2LCERN-OHL-S-2.02
Program counter
101.6 × 27.9 mm26 parts2LCERN-OHL-S-2.02
Bp leanplate
319.9 × 154.4 mm24 parts2LCERN-OHL-S-2.02
General purpose registers
101.6 × 27.9 mm23 parts2LCERN-OHL-S-2.02
General purpose register halfsize
48.3 × 27.9 mm22 parts2LCERN-OHL-S-2.02
Busreader
48.3 × 27.9 mm16 parts2LCERN-OHL-S-2.02
Lcd display
101.6 × 55.9 mm12 parts2LCERN-OHL-S-2.02