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Master updateable megarom

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

Master updateable megarom PCB layout, top view — open source board by google
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About the Master updateable megarom PCB

Master updateable megarom is an open source PCB design by google, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 36 × 49 mm, with 18 components from 5 distinct parts.

It belongs with the retro computing designs in this gallery.

From the project

Phillip Pearson's retro hardware projects for the Acorn Electron

Updateable BBC Master MegaROM =============================

A board that replaces IC24, the 1 megabit ROM containing the OS and sideways banks 9-15 on a Master 128, and allows you to update the contents of the ROM over USB (via a microcontroller) while the machine is running.

Status: I've built up a PCB with an SST39SF010A (128kB) flash chip, implemented the CPLD design, and written the AVR firmware. Flash programming and readback works with the board running standalone and inside a Master 128. I think this is ready for others to try out.

Master updateable megarom, from the project README
From the project README

Master updateable megarom bill of materials (BOM)

18 components, 5 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
jtag
JTAG1
10
—
staple_single1, staple_single2, staple_single3, staple_single4, staple_single5, staple_single6, staple_single7, staple_single8 +2
3
C28323
100n
C1, C2, C5
2
C49678
100n
C3, C4
2
1u
C6, C7

Master updateable megarom 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.

Master updateable megarom: common questions

How big is the Master updateable megarom PCB?

The Master updateable megarom measures 36 × 49 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Master updateable megarom?

18 components, from 5 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 Master updateable megarom 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 Master updateable megarom 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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