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ZX81 EPROM Upgrade

BrettHallen·Sinclair·ZX81_EPROM/ZX81_EPROM.kicad_pcb

ZX81 EPROM Upgrade PCB layout, top view — open source board by BrettHallen
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About the ZX81 EPROM Upgrade PCB

ZX81 EPROM Upgrade is an open source PCB design by BrettHallen, published on GitHub. It is a 2-layer board measuring 21 × 45 mm, with 5 components from 4 distinct parts.

Other key parts include the 27C256. By type, the board carries 2 resistors, 1 IC, 1 connector and 1 switch.

It belongs with the test & measurement designs in this gallery.

From the project

Projects for Sinclair computers (ZX80, ZX81, TS1000, TS1500, TS2068, Spectrum and clones)

Note! These projects maybe work-in-progress and thus not completed or fully tested!

Main components on the ZX81 EPROM Upgrade

27C256

ZX81 EPROM Upgrade bill of materials (BOM)

5 components, 4 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
27C256
U1
1
2364 Socket
J3
1
Bank Select
SW1
2
10KΩ
R1, R2

ZX81 EPROM Upgrade design files

The KiCad project lives in the BrettHallen/Sinclair repository on GitHub; these links point at the commit this page was built from.

ZX81 EPROM Upgrade: common questions

How big is the ZX81 EPROM Upgrade PCB?

The ZX81 EPROM Upgrade measures 21 × 45 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ZX81 EPROM Upgrade?

5 components, from 4 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 ZX81 EPROM Upgrade design files?

From the BrettHallen/Sinclair repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the ZX81 EPROM Upgrade design in my own project?

The repository has no license, so all rights stay with BrettHallen. Use it as a reference, and ask the author before reusing the design.

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