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RC6502 Serial IO

tebl·RC6502-Apple-1-Replica·RC6502 Serial IO/RC6502 Serial IO.kicad_pcb

RC6502 Serial IO PCB layout, top view — open source AVR/Arduino board by tebl

About the RC6502 Serial IO PCB

RC6502 Serial IO is an open source AVR/Arduino PCB design by tebl, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 99.1 × 66 mm, with 21 components from 14 distinct parts.

Its main chip is the Arduino Nano, from the AVR/Arduino family. Other key parts include the 74HCT04, WD65C21, 74HCT38 and MCP23S17. By type, the board carries 5 capacitors, 5 resistors, 4 ICs, 4 connectors, 1 jumper and 1 switch.

It belongs with the retro computing designs in this gallery.

From the project

An expandable SBC-version of the Apple 1 computer, easy to get started with and lot of cool stuff that can be added to it!

The original Apple 1 computer had circuitry for displaying data on a monitor as well as reading input via a physical keyboard, but to keep things simple we are instead using an Arduino Nano to this! Might not be as cool without an antique keyboard or a big and scary CRT monitor connected to it, but then again those things aren't for beginners and should you feel like adding them later there no reason as to why you can't!

RC6502 Serial IO, from the project README
From the project README

Main components on the RC6502 Serial IO

74HCT04WD65C2174HCT38MCP23S17

RC6502 Serial IO bill of materials (BOM)

21 components, 14 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
74HCT04
U1
1
WD65C21
U2
1
74HCT38
U3
1
MCP23S17
U4
1
CONN_01X39
J1
1
Arduino Nano
J2
1
SPI Breakout
J3
1
Peripheral Bus
J4
1
Power
JP1
1
Reset
SW1
1
1N4848
D1
4
100nF
C1, C2, C3, C4
1
10nF
C5
5
10k
R1, R2, R3, R4, R5

RC6502 Serial IO design files

The KiCad project lives in the tebl/RC6502-Apple-1-Replica repository on GitHub; these links point at the commit this page was built from.

RC6502 Serial IO: common questions

What microcontroller does the RC6502 Serial IO use?

The RC6502 Serial IO is built around the Arduino Nano, from the AVR/Arduino family.

How big is the RC6502 Serial IO PCB?

The RC6502 Serial IO measures 99.1 × 66 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RC6502 Serial IO?

21 components, from 14 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 RC6502 Serial IO design files?

From the tebl/RC6502-Apple-1-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 RC6502 Serial IO design in my own project?

Yes, under the terms of its GPL-3.0 license, which tebl chose for the repository.

Can I test firmware for the RC6502 Serial IO 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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