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29 lines
2.1 KiB
Markdown
29 lines
2.1 KiB
Markdown
# RC6502 Serial IO
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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).
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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.
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# Schematic
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The supplied KiCad files should be sufficient as both a schematic and as a starting
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point for ordering PCBs, the schematic is also available in
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[PDF-format](https://github.com/tebl/RC6502/raw/master/RC6502%20Serial%20IO/export/RC6502%20Serial%20IO.pdf). You can refer to the BOM below for a list of suggested components to use, part numbers in parenthesis are optional and is not required.
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# BOM
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| Reference | Item | Count |
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| --------- | ------------------------------------- | ------ |
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| PCB | Fabricate yourself using KiCad files | 1 |
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| U1 | 74LS04 | 1 |
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| U2 | MC6821 PIA | 1 |
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| U3 | 74LS138 | 1 |
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| C1-C3 | Capacitor, 100nF | 3 |
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| C4 | Capacitor, 10nF | 1 |
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| R1-R3 | Resistor, 10K (R2-R3 optional) | 1 (2) |
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| J1 | 1x39 right angle pin header, male | 1 |
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| J2 | Arduino pin headers, 1x15 pin header | 2 |
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| J3 | 1x5 right angle pin header, male | (1) |
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| JP1 | 1x2 right angle pin header, male | 1 |
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| SW1 | PCB momentary push button | 1 |
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| Nano | Arduino Nano with data cable | 1 | |