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Ram adapter

laurent-fr·junior_computer_replica·not_tested/ram-adapter/ram-adapter.kicad_pcb

Ram adapter PCB layout, top view — open source board by laurent-fr
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About the Ram adapter PCB

Ram adapter is an open source PCB design by laurent-fr, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 34.3 × 33 mm, with 5 components from 5 distinct parts.

Other key parts include the 6522 and 2114. By type, the board carries 3 ICs, 1 connector and 1 capacitor.

It belongs with the retro computing designs in this gallery.

From the project

A replica of the Junior Computer (a KIM-1 clone) published by Elektor in the 80's

The Junior Computer is a 6502 SBC made by Elektor in 1980. It looks a lot like a KIM-1.

This is a replica PCB I made with KiCAD.

The best source of information for this computer is Elektor Magazine from 80's , but you can find a lot on this website : http://retro.hansotten.nl/6502-sbc/elektuur-junior/

This board is not a 100% accurate replica, because I have added directly on the PCB a few updates published later by Elektor : a fix for memory decoding needed for the expansion board the main decoupling capacitor C2 was on wrong side of S25 (activate display) which could reset the computer *…

Ram adapter, from the project README
From the project README

Main components on the Ram adapter

65222114

Ram adapter bill of materials (BOM)

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

QtyPartRefs
1
6522
2114
IC1
1
2114
6116
IC2
1
2114
74LS00
IC3
1
CONN_01X03_SOCKET
Conn_01x04_Male
J1
1
220N
100nf
C1

Ram adapter design files

The KiCad project lives in the laurent-fr/junior_computer_replica repository on GitHub; these links point at the commit this page was built from.

Ram adapter: common questions

How big is the Ram adapter PCB?

The Ram adapter measures 34.3 × 33 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Ram adapter?

5 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 Ram adapter design files?

From the laurent-fr/junior_computer_replica repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Ram adapter design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

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