From b01b57159d23ae8bf60144f37af134c6f40157f6 Mon Sep 17 00:00:00 2001
From: Unknown <teblunde@gmail.com>
Date: Mon, 5 Jun 2017 21:56:01 +0200
Subject: [PATCH] Added Serial IO README

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 RC6502 Serial IO/README.md | 29 +++++++++++++++++++++++++++++
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 create mode 100644 RC6502 Serial IO/README.md

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+# RC6502 Serial IO
+
+This module enables serial communication with the RC6502 computer. The original Apple 1 computer communicated with the user via the expected means, a keyboard for input and ofcourse a simplified video card for output - all of this via the PIA (MC6820, MC6821, W65c21 etc).
+
+The serial module works by replacing all of this so that characters are transferred using the serial communications functionality on an Arduino Nano board. To make things easier when communicating, a MCP23S17 SPI IO-expander (see [Githup Repository](https://github.com/MajenkoLibraries/MCP23S17) for the library needed) is used as the interface between the two computer and the Nano.
+
+![Wired up](https://github.com/tebl/RC6502/raw/master/RC6502%20Serial%20IO/gallery/2017-06-02%2019.50.00.jpg)
+
+# Schematic
+The supplied KiCad files should be sufficient as both a schematic and as a starting
+point for ordering PCBs, the schematic is also available in
+[PDF-format](https://github.com/tebl/RC6502/raw/master/RC6502%20Serial%20IO/export/RC6502%20Serial%20IO.pdf).
+
+# BOM
+| Reference | Item                                  | Count  |
+| --------- | ------------------------------------- | ------ |
+| PCB       | Fabricate yourself using KiCad files  |     1  |
+| U1        | 74LS04                                |     1  |
+| U2        | MC6821 PIA                            |     1  |
+| U3        | 74LS138                               |     1  |
+| C1-C3     | Capacitor, 100nF                      |     3  |
+| C4        | Capacitor, 10nF                       |     1  |
+| R1-R3     | Resistor, 10K (R2-R3 optional)        |  1 (2) |
+| J1        | 1x39 right angle pin header, male     |     1  |
+| J2        | Arduino pin headers, 1x15 pin header  |     2  |
+| J3        | 1x5 right angle pin header, male      |    (1) |
+| JP1       | 1x2 right angle pin header, male      |     1  |
+| SW1       | PCB momentary push button             |     1  |
+| Nano      | Arduino Nano with data cable          |     1  |
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