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Added readme for ice40hx8k board

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Alan Garfield 2018-02-12 07:22:23 +11:00
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# Apple One<br>iCE40HX8K Breakout Board target
Maintainer: Alan Garfield https://github.com/alangarf
![Terasic DE0 board photo](images/terasic_DE0.jpg)
### Build environment
The project was started with IceCube2, and the project files are in the subdirectory 'icecube2'. These haven't been updated in a while, but should prove a worthy starting point. I'll endeavour to keep them updated when I can.
The project with the switch of the 6502 CPU from the gate simulated core to a logical simulated core allowed the FOSS yosys and arachne_pr to build the project. Now all you need is icestorm and the Makefile.
To build:
```
make
```
### Features
* UART support using the second serial channel on the breakout board. (CTS support OS willing).
* VGA support (will require a cable to be made).
* PS/2 support (will require a cable to be made).
* LED support using onboard LEDs on breakout, additional LEDs added to mine via a [https://www.ebay.com.au/itm/4-4-Matrix-Array-Keyboard-16-Key-Switch-Keypad-8-LED-4-Button-Professional-Blue/183044563197](YL-4 board from ebay).
### VGA Cable
### PS/2 Cable