User silkscreen reference
HoodPaul·amiga-72pin-fpm-simm·source/user-silkscreen-reference.kicad_pcb
About the User silkscreen reference PCB
User silkscreen reference is an open source PCB design by HoodPaul, published on GitHub. It is a 4-layer board measuring 108 × 25.4 mm, with 17 components from 7 distinct parts.
Other key parts include the HY5118160BJC-60 and HY5118160JC-70. By type, the board carries 4 ICs, 4 capacitors, 4 resistors and 1 connector.
It belongs with the retro computing designs in this gallery.
From the project
A common PCB for 4 MB single-sided and 8 MB double-sided 5 V FPM SIMMs, developed for Amiga 4000 motherboard memory configurations. Current revision: A7.
A common PCB for 4 MB single-sided and 8 MB double-sided 5 V FPM SIMMs, developed for Amiga 4000 motherboard memory configurations. Current revision: A7.
The project began with a wish to make RAM that visually matches Re-Amiga systems: black PCB, white silkscreen and gold contacts and exposed pads. It is a collaboration between Paul of UK Computing Limited, Jon of JMC Electronics and AI assistance through Codex.

Main components on the User silkscreen reference
User silkscreen reference bill of materials (BOM)
17 components, 7 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | HY5118160BJC-60 HY5118160JC-70 | SOJ42_400mil | U1, U2 |
| 2 | HY5118160JC-70 | SOJ42_400mil | U3, U4 |
| 1 | 72-pin / 4 or 8 MB / FPM | SIMM72 | J1 |
| 4 | 0R / OPTION | R_0603 | PD1, PD2, PD3, PD4 |
| 4 | 220 nF / 16 V X7R | C_0805 | C1, C2, C3, C4 |
| 2 | 0R / REAR EN | R_0603 | R1, R2 |
| 2 | 10k / REAR PULLUP | R_0603 | R3, R4 |
User silkscreen reference design files
The KiCad project lives in the HoodPaul/amiga-72pin-fpm-simm repository on GitHub; these links point at the commit this page was built from.
User silkscreen reference: common questions
How big is the User silkscreen reference PCB?
The User silkscreen reference measures 108 × 25.4 mm, has 4 copper layers and is 1.2 mm thick.
How many components are on the User silkscreen reference?
17 components, from 7 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the User silkscreen reference design files?
From the HoodPaul/amiga-72pin-fpm-simm repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the User silkscreen reference design in my own project?
The repository has no license, so all rights stay with HoodPaul. Use it as a reference, and ask the author before reusing the design.
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