Agnus
About the Agnus PCB
Agnus is an open source PCB design by LinuxJedi, published on GitHub under the GPL-2.0 license. It is a 4-layer board measuring 81.8 × 46.1 mm, with 22 components from 12 distinct parts.
Other key parts include the Agnus8372, Agnus8375, 74AHC1G08, 74LVC2G157 and GM71C18163C. By type, the board carries 10 capacitors, 7 ICs, 2 connectors, 2 resistors and 1 jumper.
It belongs with the retro computing designs in this gallery.
From the project
RAMesses Amiga 2MB Chip RAM board
RAMesses is a plug and play Amiga 500/2000/CDTV board which will convert a 2MB 8375 Agnus to work in a 512KB/1MB motherboard and add 2MB of RAM. RAMesses has two switchable modes, the first gives the full 2MB to Chip RAM, the second gives 1MB of Chip RAM and 512KB of Pseudo-Fast RAM. This is for compatibility with older games.
The project is in two parts, one is a board that sits in the Agnus socket and the other is a board that sits in the Gary socket, the two boards need to be linked together with a four wire cable, preferably around 20cm in length.
Main components on the Agnus
Agnus bill of materials (BOM)
22 components, 12 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Agnus8372 | PLCC Plug | U1 |
| 1 | Agnus8375 | PLCC-84_THT-Socket | U2 |
| 1 | 74AHC1G08 | SOT-23-5_HandSoldering | U3 |
| 3 | 74LVC2G157 | VSSOP-8_2.3x2mm_P0.5mm | U4, U5, U7 |
| 1 | GM71C18163C | SOJ-42 | U6 |
| 1 | ADDR | PinSocket_1x04_P1.27mm_Vertical | J1 |
| 1 | Conn_01x02 | PinHeader_1x02_P2.54mm_Horizontal | J6 |
| 1 | VBB | PinHeader_1x02_P2.54mm_Horizontal | JP1 |
| 9 | 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2, C3, C4, C5, C6, C7, C8 +1 |
| 1 | 22pF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C10 |
| 1 | 150 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1 |
| 1 | 4.7K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2 |
Agnus design files
The KiCad project lives in the LinuxJedi/RAMesses repository on GitHub; these links point at the commit this page was built from.
- LayoutAgnus/Agnus.kicad_pcb
- SchematicAgnus/Agnus.kicad_sch
Agnus: common questions
How big is the Agnus PCB?
The Agnus measures 81.8 × 46.1 mm, has 4 copper layers and is 1.624 mm thick.
How many components are on the Agnus?
22 components, from 12 distinct parts. The full bill of materials is listed on this page.
Where can I download the Agnus design files?
From the LinuxJedi/RAMesses repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Agnus design in my own project?
Yes, under the terms of its GPL-2.0 license, which LinuxJedi chose for the repository.
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