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RC1 8K ExRAM

tebl·RC-ONE·RC1 8K ExRAM/RC1 8K ExRAM.kicad_pcb

RC1 8K ExRAM PCB layout, top view — open source AVR/Arduino board by tebl

About the RC1 8K ExRAM PCB

RC1 8K ExRAM is an open source AVR/Arduino PCB design by tebl, published on GitHub under the CERN-OHL-1.2 license. It is a 2-layer board measuring 99.1 × 83.8 mm, with 36 components from 20 distinct parts.

Its main chip is the Arduino_Nano_v3.x, from the AVR/Arduino family. Other key parts include the 74LS138, 74LS00, 74HC595, HM62256BLP-7 and 74LS244. By type, the board carries 8 ICs, 8 capacitors, 8 resistors, 6 diodes, 3 connectors and 2 jumpers.

It belongs with the retro computing and displays & leds designs in this gallery.

From the project

A recreation of the MOS KIM-1 microcomputer, the start of the Commodore-line of computers. Complete with hex keypad, six digit displays and a lot of 8-bit fun!

Originally created by MOS in order to show off their new 6502-processor, it was a success that tapped into a market they probably never knew themselves was growing into a force to be reckoned with - the homecomputing market! Later bought up by little-known typewriter-manufacturer Commodore, the KIM-1 is an iconic piece of hardware and since I can't afford to buy one I'll build one instead.

RC1 8K ExRAM, from the project README
From the project README

Main components on the RC1 8K ExRAM

74LS13874LS0074HC595HM62256BLP-774LS24474LS245Arduino_Nano_v3.x

RC1 8K ExRAM bill of materials (BOM)

36 components, 20 distinct parts.

QtyPartRefs
1
74LS138
U1
1
74LS00
U2
2
74HC595
U3, U4
1
HM62256BLP-7
U5
2
74LS244
U6, U7
1
74LS245
U8
1
Arduino_Nano_v3.x
A1
1
Expansion
J1
1
ADDRESS
J2
1
BATTERY
J3
1
USB_PWR
JP1
1
ReadOnly
JP2
1
BUSY
D1
1
DATA
D2
1
CLK
D3
1
1N4001
D4
2
1N4001
D5, D6
8
100nF
C1, C2, C3, C4, C5, C6, C7, C8
3
220
R1, R2, R3
5
3k3
R4, R5, R6, R7, R8

RC1 8K ExRAM design files

The KiCad project lives in the tebl/RC-ONE repository on GitHub; these links point at the commit this page was built from.

RC1 8K ExRAM: common questions

What microcontroller does the RC1 8K ExRAM use?

The RC1 8K ExRAM is built around the Arduino_Nano_v3.x, from the AVR/Arduino family.

How big is the RC1 8K ExRAM PCB?

The RC1 8K ExRAM measures 99.1 × 83.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RC1 8K ExRAM?

36 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the RC1 8K ExRAM design files?

From the tebl/RC-ONE repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the RC1 8K ExRAM design in my own project?

Yes, under the terms of its CERN-OHL-1.2 license, which tebl chose for the repository.

Can I test firmware for the RC1 8K ExRAM without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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