Acorn electron expansion

google·myelin-acorn-electron-hardware·expansion_minispartan_breakout/pcb/acorn-electron-expansion.kicad_pcb

Acorn electron expansion PCB layout, top view — open source board by google

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About the Acorn electron expansion PCB

Acorn electron 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 100 × 100 mm, with 21 components from 17 distinct parts.

Other key parts include the 74hct125d, C75561, 74LVC245 A0-7, 74LVC245 A8-15 and 74LVC245. By type, the board carries 7 resistors, 6 ICs, 5 capacitors and 3 connectors.

It belongs with the retro computing designs in this gallery.

From the project

Phillip Pearson's retro hardware projects for the Acorn Electron

expansionminispartanbreakout ==============================

Superseded by cpusocketexpansion and cpusocketminispartandaughterboard._

This board breaks out the expansion connector to 0.1" holes, and provides the necessary level conversion and buffering to allow a Scarab miniSpartan6+ board to interface with the Electron's expansion connector.

I've assembled and tested one rev 1 board, with the miniSpartan6+ configured to provide a few ROM banks, and it works pretty nicely. I made some changes for rev 2 to allow switching the direction of the address buffers, which would make it possible to…

Acorn electron expansion, from the project README — From the project README

Main components on the Acorn electron expansion

74hct125d C75561 74LVC245 A0-7 74LVC245 A8-15 74LVC245 scarab_mini_spartan_6_lx25

Acorn electron expansion bill of materials (BOM)

21 components, 17 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	74hct125d	SOIC-14_3.9x8.7mm_Pitch1.27mm	U1
1	C75561 74LVC245 D0-7	SSOP-20_4.4x6.5mm_Pitch0.65mm	U2
1	74LVC245 A0-7	SSOP-20_4.4x6.5mm_Pitch0.65mm	U3
1	74LVC245 A8-15	SSOP-20_4.4x6.5mm_Pitch0.65mm	U4
1	74LVC245	SSOP-20_4.4x6.5mm_Pitch0.65mm	U5
1	scarab_mini_spartan_6_lx25	scarab_mini_spartan_6_lx25	U6
1	Acorn Electron Expansion Connector (fit connector underneath PCB)	acorn_electron_48pin_expansion_connector	P1
1	CONN_02X24	Pin_Header_Straight_2x24_Pitch2.54mm	P2
1	5V / 5V0	Pin_Header_Straight_1x02_Pitch2.54mm	P3
3	C28323 100n	C0805_nosilkscreen	C1, C2, C5
2	C49678 100n	C0805_nosilkscreen	C3, C4
1	C17414 10k	R0805_nosilkscreen	R1
1	C17513 10k	R0805_nosilkscreen	R2
1	C17630 10k	R0805_nosilkscreen	R3
2	C17673 10k	R0805_nosilkscreen	R4, R5
1	C17520 10k	R_0805_HandSoldering	R6
1	C17513 10k	R_0805_HandSoldering	R7

Acorn electron 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.

Acorn electron expansion: common questions

How big is the Acorn electron expansion PCB?

The Acorn electron expansion measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Acorn electron expansion?

21 components, from 17 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 Acorn electron 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 Acorn electron 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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