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Cpu socket expansion

google·myelin-acorn-electron-hardware·cpu_socket_expansion/pcb/cpu_socket_expansion.kicad_pcb

Cpu socket expansion PCB layout, top view — open source board by google
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About the Cpu socket expansion PCB

Cpu socket expansion is an open source PCB design by google, 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.

It belongs with the retro computing designs in this gallery.

From the project

Phillip Pearson's retro hardware projects for the Acorn Electron

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, from the project README
From the project README

Cpu socket expansion bill of materials (BOM)

52 components, 15 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
16MHz
M16
2
6502
CPU1, CPU2
1
VPB
JP1
1
jtag
JTAG1
33
—
staple_single1, staple_single2, staple_single3, staple_single4, staple_single5, staple_single6, staple_single7, staple_single8 +25
2
C28323
100n
C1, C5
1
C28323
1u
C2
1
C49678
1u
C3
2
C49678
100n
C4, C8
2
100n
C6, C7
1
C17414
4k7
R1
1
C17513
10k
R2
1
C17630
10k
R3
2
C17673
10k
R4, R5
1
C17520
10k
R6

Cpu socket expansion design files

The KiCad project lives in the 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 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 google chose for the repository.

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