Cpu socket expansion
About the Cpu socket expansion PCB
Cpu socket expansion is an open source PCB design by ep-infosec, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 42.6 × 74.7 mm, with 52 components from 15 distinct parts.
By type, the board carries 8 capacitors, 6 resistors, 1 module and 1 jumper.
From the project
Board that intercepts signals from the Acorn Electron or BBC Micro's 6502 CPU, and provides a very flexible interface into the heart of the machine. (Good enough to implement something like the Slogger MRB, or to use a soft CPU in an FPGA, or to do a 3.3V flash/RAM/IO board.)
Board that intercepts signals from the Acorn Electron or BBC Micro's 6502 CPU, and provides a very flexible interface into the heart of the machine. (Good enough to implement something like the Slogger MRB, or to use a soft CPU in an FPGA, or to do a 3.3V flash/RAM/IO board.)
I've assembled one of these and tried it out with no daughterboard connected, in an Electron, with very basic HDL that just copies A15:A13 from the CPU to the motherboard. It boots fine, as expected.
Cpu socket expansion bill of materials (BOM)
52 components, 15 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 16MHz | Pin_Header_Straight_1x02_Pitch2.54mm | M16 |
| 2 | 6502 | DIP-40_W15.24mm | CPU1, CPU2 |
| 1 | VPB | Pin_Header_Straight_1x02_Pitch2.54mm | JP1 |
| 1 | jtag | Pin_Header_Straight_2x05_Pitch2.54mm | JTAG1 |
| 33 | — | via_single | staple_single1, staple_single2, staple_single3, staple_single4, staple_single5, staple_single6, staple_single7, staple_single8 +25 |
| 2 | C28323 100n | C_0805_HandSoldering | C1, C5 |
| 1 | C28323 1u | C_0805_HandSoldering | C2 |
| 1 | C49678 1u | C_0805_HandSoldering | C3 |
| 2 | C49678 100n | C_0805_HandSoldering | C4, C8 |
| 2 | 100n | C_0805_HandSoldering | C6, C7 |
| 1 | C17414 4k7 | R_0805_HandSoldering | R1 |
| 1 | C17513 10k | R_0805_HandSoldering | R2 |
| 1 | C17630 10k | R_0805_HandSoldering | R3 |
| 2 | C17673 10k | R_0805_HandSoldering | R4, R5 |
| 1 | C17520 10k | R_0805_HandSoldering | R6 |
Cpu socket expansion design files
The KiCad project lives in the ep-infosec/50_google_myelin-acorn-electron-hardware repository on GitHub; these links point at the commit this page was built from.
Cpu socket expansion: common questions
How big is the Cpu socket expansion PCB?
The Cpu socket expansion measures 42.6 × 74.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Cpu socket expansion?
52 components, from 15 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 Cpu socket expansion design files?
From the ep-infosec/50_google_myelin-acorn-electron-hardware repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Cpu socket expansion design in my own project?
Yes, under the terms of its Apache-2.0 license, which ep-infosec chose for the repository.
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